python - Error: bad runtime process port [''] on App Engine -


i'm developing site gae , webapp2. while running development server, following error out of nowhere, no stack trace:

http_runtime.py:404] bad runtime process port ['']

sometimes happens when change part of database schema (it's still in development) , problem fixed if restart server , clear datastore. happens seemingly no reason.

the solution restart server, feel weird not knowing why i'm getting error. happens when server has been long? there can prevent it? happen in production? want know before start thinking deploying.

for reference error coming line of code:

https://code.google.com/p/googleappengine/source/browse/trunk/python/google/appengine/tools/devappserver2/http_runtime.py

it in start() function maybe causing dev_app_server restart , trying reuse port not available anymore?

can try enable debugging devappserver , see if can reproduce , paste in context?

dev_appserver.py --dev_appserver_log_level=debug sets log output debug level.

from dev_appserver.py --help


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