Traceback (most recent call last):
  File "/home/andreas/Projekte/openlp/trunk/openlp/core/ui/mainwindow.py", line 783, in onFirstTimeWizardClicked
    self.firstTime()
  File "/home/andreas/Projekte/openlp/trunk/openlp/core/ui/mainwindow.py", line 755, in firstTime
    plugin.firstTime()
  File "/home/andreas/Projekte/openlp/trunk/openlp/plugins/songs/songsplugin.py", line 258, in firstTime
    importer.doImport()
  File "/home/andreas/Projekte/openlp/trunk/openlp/plugins/songs/lib/olpimport.py", line 147, in doImport
    backref='songs', primaryjoin=source_songs_table.c.id==OldMediaFile.song_id,
AttributeError: type object 'OldMediaFile' has no attribute 'song_id'