Troubleshooting¶
A few common issues are reported when trying to run Dallinger. Always run with the –verbose flag for full logs
Python Processes Kept Alive¶
Sometimes when trying to run experiments consecutively in Debug mode, a straggling process creates Server 500 errors. These are caused by background python processes and/or gunicorn workers. Filter for them using:
ps -ef | grep -E "python|gunicorn"
This will display all running processes that have the name python or gunicorn. To kill all of them, run these commands:
pkill python
pkill gunicorn
Known Postgres issues¶
If you get an error like the following…
createuser: could not connect to database postgres: could not connect to server:
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
…then you probably did not start the app.
If you get a fatal error that your ROLE does not exist, run these commands:
createuser dallinger
dropdb dallinger
createdb -O dallinger dallinger
Common Sandbox Error¶
❯❯ Launching the experiment on MTurk...
❯❯ Error parsing response from /launch, check web dyno logs for details: <!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta charset="utf-8">
<title>Application Error</title>
<style media="screen">
html,body,iframe {
margin: 0;
padding: 0;
}
html,body {
height: 100%;
overflow: hidden;
}
iframe {
width: 100%;
height: 100%;
border: 0;
}
</style>
</head>
<body>
<iframe src="//www.herokucdn.com/error-pages/application-error.html"></iframe>
</body>
</html>
Traceback (most recent call last):
File "/Users/user/.virtualenvs/dallinger/bin/dallinger", line 11, in <module>
load_entry_point('dallinger', 'console_scripts', 'dallinger')()
File "/Users/user/.virtualenvs/dallinger/lib/python3.6/site-packages/click/core.py", line 722, in __call__
return self.main(*args, **kwargs)
File "/Users/user/.virtualenvs/dallinger/lib/python3.6/site-packages/click/core.py", line 697, in main
rv = self.invoke(ctx)
File "/Users/user/.virtualenvs/dallinger/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/Users/user/.virtualenvs/dallinger/lib/python3.6/site-packages/click/core.py", line 895, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/Users/user/.virtualenvs/dallinger/lib/python3.6/site-packages/click/core.py", line 535, in invoke
return callback(*args, **kwargs)
File "/Users/user/Dallinger/dallinger/command_line.py", line 558, in sandbox
_deploy_in_mode(u'sandbox', app, verbose)
File "/Users/user/Dallinger/dallinger/command_line.py", line 550, in _deploy_in_mode
deploy_sandbox_shared_setup(verbose=verbose, app=app)
File "/Users/user/Dallinger/dallinger/command_line.py", line 518, in deploy_sandbox_shared_setup
launch_data = _handle_launch_data('{}/launch'.format(heroku_app.url))
File "/Users/user/Dallinger/dallinger/command_line.py", line 386, in _handle_launch_data
launch_data = launch_request.json()
File "/Users/user/.virtualenvs/dallinger/lib/python3.6/site-packages/requests/models.py", line 892, in json
return complexjson.loads(self.text, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/__init__.py", line 339, in loads
return _default_decoder.decode(s)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/decoder.py", line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/decoder.py", line 382, in raw_decode
raise ValueError("No JSON object could be decoded")
If you get this from the sandbox, this usually means there’s a deeper issue that requires dallinger logs –app XXXXXX. Usually this could be a requirements.txt file error (missing dependency or reference to an incorrect branch).