Locust failing with "failed with TemplateAssertionError"

[epicbugs]

I wanted to load test redis and found https://iamabhishek-dubey.medium.com/redis-load-testing-d99f81e97842

Locust starts successfully after running ./start.sh but when I open browser at http://localhost:8089/ it displays "Internal Server Error". Backend logs say something about "failed with TemplateAssertionError".

• Ubuntu 20.04.4 LTS (running on Windows Linux Subsystem)
• Python 3.8.10
• pip 20.0.2 from /usr/lib/python3/dist-packages/pip (python 3.8)
• locust 2.8.6

Any ideas what is causing the error and how to make the utility work? Stack traces below.

====================

Traceback (most recent call last):
File "/home/user/.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 999, in handle_one_response
self.run_application()
File "/home/user/.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 945, in run_application
self.result = self.application(self.environ, self.start_response)
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 2095, in call
return self.wsgi_app(environ, start_response)
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 2080, in wsgi_app
response = self.handle_exception(e)
File "/home/user/.local/lib/python3.8/site-packages/flask_cors/extension.py", line 165, in wrapped_function
return cors_after_request(app.make_response(f(*args, **kwargs)))
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 2077, in wsgi_app
response = self.full_dispatch_request()
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 1525, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/user/.local/lib/python3.8/site-packages/flask_cors/extension.py", line 165, in wrapped_function
return cors_after_request(app.make_response(f(*args, **kwargs)))
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 1523, in full_dispatch_request
rv = self.dispatch_request()
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 1509, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "/home/user/.local/lib/python3.8/site-packages/locust/web.py", line 399, in wrapper
return view_func(*args, **kwargs)
File "/home/user/.local/lib/python3.8/site-packages/locust/web.py", line 135, in index
return render_template("index.html", **self.template_args)
File "/home/user/.local/lib/python3.8/site-packages/flask/templating.py", line 149, in render_template
ctx.app.jinja_env.get_or_select_template(template_name_or_list),
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 869, in get_or_select_template
return self.get_template(template_name_or_list, parent, globals)
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 830, in get_template
return self._load_template(name, self.make_globals(globals))
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 804, in _load_template
template = self.loader.load(self, name, globals)
File "/usr/lib/python3/dist-packages/jinja2/loaders.py", line 125, in load
code = environment.compile(source, name, filename)
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 591, in compile
self.handle_exception(exc_info, source_hint=source_hint)
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File "/usr/lib/python3/dist-packages/jinja2/_compat.py", line 37, in reraise
raise value.with_traceback(tb)
File "/home/user/.local/lib/python3.8/site-packages/locust/templates/index.html", line 85, in
{% if not ((value is none) or (value is boolean)) %}
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 542, in _generate
return generate(source, self, name, filename, defer_init=defer_init,
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 82, in generate
generator.visit(node)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 754, in visit_Template
self.blockvisit(node.body, frame)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 378, in blockvisit
self.visit(node, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1122, in visit_For
self.blockvisit(node.body, loop_frame)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 378, in blockvisit
self.visit(node, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1157, in visit_If
self.visit(node.test, if_frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
return f(self, node, frame, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1497, in visitor
self.visit(node.node, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
return f(self, node, frame, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1484, in visitor
self.visit(node.right, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
return f(self, node, frame, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1607, in visit_Test
self.fail('no test named %r' % node.name, node.lineno)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 315, in fail
raise TemplateAssertionError(msg, lineno, self.name, self.filename)
jinja2.exceptions.TemplateAssertionError: no test named 'boolean'
2022-05-11T12:10:35Z {'REMOTE_ADDR': '::1', 'REMOTE_PORT': '48516', 'HTTP_HOST': 'localhost:8089', (hidden keys: 32)} failed with TemplateAssertionError

Traceback (most recent call last):
File "/home/user/.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 999, in handle_one_response
self.run_application()
File "/home/user/.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 945, in run_application
self.result = self.application(self.environ, self.start_response)
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 2095, in call
return self.wsgi_app(environ, start_response)
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 2080, in wsgi_app
response = self.handle_exception(e)
File "/home/user/.local/lib/python3.8/site-packages/flask_cors/extension.py", line 165, in wrapped_function
return cors_after_request(app.make_response(f(*args, **kwargs)))
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 2077, in wsgi_app
response = self.full_dispatch_request()
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 1525, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/user/.local/lib/python3.8/site-packages/flask_cors/extension.py", line 165, in wrapped_function
return cors_after_request(app.make_response(f(*args, **kwargs)))
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 1523, in full_dispatch_request
rv = self.dispatch_request()
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 1509, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "/home/user/.local/lib/python3.8/site-packages/locust/web.py", line 399, in wrapper
return view_func(*args, **kwargs)
File "/home/user/.local/lib/python3.8/site-packages/locust/web.py", line 135, in index
return render_template("index.html", **self.template_args)
File "/home/user/.local/lib/python3.8/site-packages/flask/templating.py", line 149, in render_template
ctx.app.jinja_env.get_or_select_template(template_name_or_list),
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 869, in get_or_select_template
return self.get_template(template_name_or_list, parent, globals)
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 830, in get_template
return self._load_template(name, self.make_globals(globals))
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 804, in _load_template
template = self.loader.load(self, name, globals)
File "/usr/lib/python3/dist-packages/jinja2/loaders.py", line 125, in load
code = environment.compile(source, name, filename)
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 591, in compile
self.handle_exception(exc_info, source_hint=source_hint)
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File "/usr/lib/python3/dist-packages/jinja2/_compat.py", line 37, in reraise
raise value.with_traceback(tb)
File "/home/user/.local/lib/python3.8/site-packages/locust/templates/index.html", line 85, in
{% if not ((value is none) or (value is boolean)) %}
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 542, in _generate
return generate(source, self, name, filename, defer_init=defer_init,
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 82, in generate
generator.visit(node)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 754, in visit_Template
self.blockvisit(node.body, frame)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 378, in blockvisit
self.visit(node, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1122, in visit_For
self.blockvisit(node.body, loop_frame)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 378, in blockvisit
self.visit(node, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1157, in visit_If
self.visit(node.test, if_frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
return f(self, node, frame, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1497, in visitor
self.visit(node.node, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
return f(self, node, frame, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1484, in visitor
self.visit(node.right, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
return f(self, node, frame, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1607, in visit_Test
self.fail('no test named %r' % node.name, node.lineno)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 315, in fail
raise TemplateAssertionError(msg, lineno, self.name, self.filename)
jinja2.exceptions.TemplateAssertionError: no test named 'boolean'
2022-05-11T12:10:38Z {'REMOTE_ADDR': '::1', 'REMOTE_PORT': '48518', 'HTTP_HOST': 'localhost:8089', (hidden keys: 33)} failed with TemplateAssertionError

Traceback (most recent call last):
File "/home/user/.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 999, in handle_one_response
self.run_application()
File "/home/user/.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 945, in run_application
self.result = self.application(self.environ, self.start_response)
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 2095, in call
return self.wsgi_app(environ, start_response)
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 2080, in wsgi_app
response = self.handle_exception(e)
File "/home/user/.local/lib/python3.8/site-packages/flask_cors/extension.py", line 165, in wrapped_function
return cors_after_request(app.make_response(f(*args, **kwargs)))
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 2077, in wsgi_app
response = self.full_dispatch_request()
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 1525, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/user/.local/lib/python3.8/site-packages/flask_cors/extension.py", line 165, in wrapped_function
return cors_after_request(app.make_response(f(*args, **kwargs)))
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 1523, in full_dispatch_request
rv = self.dispatch_request()
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 1509, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "/home/user/.local/lib/python3.8/site-packages/locust/web.py", line 399, in wrapper
return view_func(*args, **kwargs)
File "/home/user/.local/lib/python3.8/site-packages/locust/web.py", line 135, in index
return render_template("index.html", **self.template_args)
File "/home/user/.local/lib/python3.8/site-packages/flask/templating.py", line 149, in render_template
ctx.app.jinja_env.get_or_select_template(template_name_or_list),
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 869, in get_or_select_template
return self.get_template(template_name_or_list, parent, globals)
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 830, in get_template
return self._load_template(name, self.make_globals(globals))
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 804, in _load_template
template = self.loader.load(self, name, globals)
File "/usr/lib/python3/dist-packages/jinja2/loaders.py", line 125, in load
code = environment.compile(source, name, filename)
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 591, in compile
self.handle_exception(exc_info, source_hint=source_hint)
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File "/usr/lib/python3/dist-packages/jinja2/_compat.py", line 37, in reraise
raise value.with_traceback(tb)
File "/home/user/.local/lib/python3.8/site-packages/locust/templates/index.html", line 85, in
{% if not ((value is none) or (value is boolean)) %}
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 542, in _generate
return generate(source, self, name, filename, defer_init=defer_init,
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 82, in generate
generator.visit(node)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 754, in visit_Template
self.blockvisit(node.body, frame)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 378, in blockvisit
self.visit(node, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1122, in visit_For
self.blockvisit(node.body, loop_frame)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 378, in blockvisit
self.visit(node, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1157, in visit_If
self.visit(node.test, if_frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
return f(self, node, frame, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1497, in visitor
self.visit(node.node, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
return f(self, node, frame, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1484, in visitor
self.visit(node.right, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
return f(self, node, frame, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1607, in visit_Test
self.fail('no test named %r' % node.name, node.lineno)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 315, in fail
raise TemplateAssertionError(msg, lineno, self.name, self.filename)
jinja2.exceptions.TemplateAssertionError: no test named 'boolean'
2022-05-11T12:10:38Z {'REMOTE_ADDR': '::1', 'REMOTE_PORT': '48520', 'HTTP_HOST': 'localhost:8089', (hidden keys: 33)} failed with TemplateAssertionError

Traceback (most recent call last):
File "/home/user/.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 999, in handle_one_response
self.run_application()
File "/home/user/.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 945, in run_application
self.result = self.application(self.environ, self.start_response)
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 2095, in call
return self.wsgi_app(environ, start_response)
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 2080, in wsgi_app
response = self.handle_exception(e)
File "/home/user/.local/lib/python3.8/site-packages/flask_cors/extension.py", line 165, in wrapped_function
return cors_after_request(app.make_response(f(*args, **kwargs)))
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 2077, in wsgi_app
response = self.full_dispatch_request()
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 1525, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/user/.local/lib/python3.8/site-packages/flask_cors/extension.py", line 165, in wrapped_function
return cors_after_request(app.make_response(f(*args, **kwargs)))
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 1523, in full_dispatch_request
rv = self.dispatch_request()
File "/home/user/.local/lib/python3.8/site-packages/flask/app.py", line 1509, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "/home/user/.local/lib/python3.8/site-packages/locust/web.py", line 399, in wrapper
return view_func(*args, **kwargs)
File "/home/user/.local/lib/python3.8/site-packages/locust/web.py", line 135, in index
return render_template("index.html", **self.template_args)
File "/home/user/.local/lib/python3.8/site-packages/flask/templating.py", line 149, in render_template
ctx.app.jinja_env.get_or_select_template(template_name_or_list),
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 869, in get_or_select_template
return self.get_template(template_name_or_list, parent, globals)
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 830, in get_template
return self._load_template(name, self.make_globals(globals))
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 804, in _load_template
template = self.loader.load(self, name, globals)
File "/usr/lib/python3/dist-packages/jinja2/loaders.py", line 125, in load
code = environment.compile(source, name, filename)
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 591, in compile
self.handle_exception(exc_info, source_hint=source_hint)
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File "/usr/lib/python3/dist-packages/jinja2/_compat.py", line 37, in reraise
raise value.with_traceback(tb)
File "/home/user/.local/lib/python3.8/site-packages/locust/templates/index.html", line 85, in
{% if not ((value is none) or (value is boolean)) %}
File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 542, in _generate
return generate(source, self, name, filename, defer_init=defer_init,
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 82, in generate
generator.visit(node)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 754, in visit_Template
self.blockvisit(node.body, frame)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 378, in blockvisit
self.visit(node, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1122, in visit_For
self.blockvisit(node.body, loop_frame)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 378, in blockvisit
self.visit(node, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1157, in visit_If
self.visit(node.test, if_frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
return f(self, node, frame, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1497, in visitor
self.visit(node.node, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
return f(self, node, frame, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1484, in visitor
self.visit(node.right, frame)
File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
return f(node, *args, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
return f(self, node, frame, **kwargs)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1607, in visit_Test
self.fail('no test named %r' % node.name, node.lineno)
File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 315, in fail
raise TemplateAssertionError(msg, lineno, self.name, self.filename)
jinja2.exceptions.TemplateAssertionError: no test named 'boolean'
2022-05-11T12:12:11Z {'REMOTE_ADDR': '::1', 'REMOTE_PORT': '48522', 'HTTP_HOST': 'localhost:8089', (hidden keys: 34)} failed with TemplateAssertionError