TypeError with Play 1.1 beta2

[roymax]

play scaffold:gen
~ _ _
~ _ __ | | __ _ _ | |
~ | ' | |/ ' | || ||
~ | /|_|__|__ ()
~ || |*/
~
~ play! 1.1-beta2, http://www.playframework.org
~ framework ID is roy
~
executing command: scaffold:gen
Traceback (most recent call last):
File "/opt/local/bin/play", line 106, in
cmdloader.commands[play_command].execute(command=play_command, app=play_app, args=remaining_args, env=play_env, cmdloader=cmdloader)
File "/opt/local/share/play-1.1-beta2/modules/scaffold-head/commands.py", line 25, in execute
run(app, args)
File "/opt/local/share/play-1.1-beta2/modules/scaffold-head/commands.py", line 30, in run
subprocess.call(java_cmd, env=os.environ)
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/subprocess.py", line 444, in call
return Popen(_popenargs, _kwargs).wait()
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/subprocess.py", line 595, in __init
errread, errwrite)
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/subprocess.py", line 1106, in _execute_child
raise child_exception
TypeError: coercing to Unicode: need string or buffer, list found