In my previous stacktrace there was /usr/lib/deskbar-applet/modules-2.20-compatible/twitter.pyc. After removing /usr/lib/deskbar-applet/modules-2.20-compatible/twitter.py and /usr/lib/deskbar-applet/modules-2.20-compatible/twitter.pyc everything works
In my previous stacktrace there was /usr/lib/ deskbar- applet/ modules- 2.20-compatible /twitter. pyc. After removing /usr/lib/ deskbar- applet/ modules- 2.20-compatible /twitter. py and /usr/lib/ deskbar- applet/ modules- 2.20-compatible /twitter. pyc everything works