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Hi, Alessandro Molina.
I've just upgraded my TurboGears2-based application from 2.1.1 to 2.2.0, and needed to perform this minor adjustment to keep TurboGears from crashing when accessing our platform from a mobile phone.
The error message that now is avoided was:
File "/…/tg2env/lib/python2.6/site-packages/tg/decorators.py", line 194, in lookup_template_engine
ValueError: need more than 3 values to unpack