TypeError Expected string or unicode object File home razum2um learnin

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TypeError: Expected a string or unicode object
File "/home/razum2um/learning_python/qt4/tray.py", line 34, in <module>
[], 0, dbus_interface="org.kde.KNotify")
File "/usr/lib64/python2.6/site-packages/dbus/proxies.py", line 68, in __call__
return self._proxy_method(*args, **keywords)
File "/usr/lib64/python2.6/site-packages/dbus/proxies.py", line 140, in __call__
**keywords)
File "/usr/lib64/python2.6/site-packages/dbus/connection.py", line 612, in call_blocking
message.append(signature=signature, *args)