How can I solve this kazam problem?

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http://askubuntu.com – I want to record my desktop activity. Before ı could use kazam. but after a while kazam started to give an error. how can i solve it? When running kazam via the terminal I get this output: Traceback (most recent call last): File "/usr/bin/kazam", line 74, in <module> appWindow = KazamApp(datadir, args.debug) File "/usr/lib/python2.7/dist-packages/kazam/app.py", line 238, in __init__ self.restore_state() File "/usr/lib/python2.7/dist-packages/kazam/app.py", line 578, in restore_state self.volumebutton_audio2.set_value(audio2_vol) File "/usr/lib/python2.7/dist-pa (HowTos)