wrong behaviour at startup__raise VersionConflict(dist, req).with_context(dependent_req) pkg_resources.ContextualVersionConflict: (rlp 0.6.0 (/sba/Ethereum/pyethapp/.venv/lib/python2.7/site-packages), Requirement.parse('rlp<0.6.0,>=0.5.1'), set(['devp2p']))

[souleb]

Checklist

• [ +] installed pyethapp inside a virtualenv

System/environment

• OS: 16.04.2-Ubuntu
• python version: Python 2.7.12
• pyethapp version: 1.5.0
• installation method (pip & pypi/git & setup.py): pip & git

Expected behaviour

(.venv) ~/ethereum/pyethapp/$ pyethapp
Usage: pyethapp [OPTIONS] COMMAND [ARGS]...

Welcome to ethapp version...

Options:
[…]

Observed behaviour

(.venv) ~/Ethereum/pyethapp$ pyethapp
Traceback (most recent call last):
File "/sba/Ethereum/pyethapp/.venv/bin/pyethapp", line 6, in
from pkg_resources import load_entry_point
File "/sba/Ethereum/pyethapp/.venv/local/lib/python2.7/site-packages/pkg_resources/init.py", line 3138, in
@_call_aside
File "/sba/Ethereum/pyethapp/.venv/local/lib/python2.7/site-packages/pkg_resources/init.py", line 3122, in _call_aside
f(*args, **kwargs)
File "/sba/Ethereum/pyethapp/.venv/local/lib/python2.7/site-packages/pkg_resources/init.py", line 3151, in _initialize_master_working_set
working_set = WorkingSet._build_master()
File "/sba/Ethereum/pyethapp/.venv/local/lib/python2.7/site-packages/pkg_resources/init.py", line 666, in _build_master
return cls._build_from_requirements(requires)
File "/sba/Ethereum/pyethapp/.venv/local/lib/python2.7/site-packages/pkg_resources/init.py", line 679, in _build_from_requirements
dists = ws.resolve(reqs, Environment())
File "/sba/Ethereum/pyethapp/.venv/local/lib/python2.7/site-packages/pkg_resources/init.py", line 872, in resolve
raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (rlp 0.6.0 (/sba/Ethereum/pyethapp/.venv/lib/python2.7/site-packages), Requirement.parse('rlp<0.6.0,>=0.5.1'), set(['devp2p']))

Steps to reproduce

[pglezen]

This is probably a duplicate of issue #253.

If you change your requirements.txt as specified in this pull request, you might be fine.

https://github.com/ethereum/pyethapp/pull/255/files

I followed Matsulib's tip by uninstalling rlp and installing a back-level version along with the required websocket libraries.

pip install rlp==-0.5.1
pip install prat-geventwebsocket

Then I was able to start the pyethapp client successfully.