CKAR crash upon tree collecting - or executing not sure

[wooloogooloo]

From terminal: Traceback (most recent call last): File "codeklavier.py", line 227, in perform(configfile=config, prototype=play) File "codeklavier.py", line 113, in perform eval(prototype.main()) File "/Users/Anne/codeklavier/ckalculator/ckalculator.py", line 96, in main ck_deltatime=ck_deltatime, articulation=articulation) File "/Users/Anne/codeklavier/CodeKlavier/ckalculator_classes.py", line 573, in parse_midi self.ar.toggleShapeNext(parallelTrees=True) File "/Users/Anne/codeklavier/CodeKlavier/ar_classes.py", line 151, in toggleShapeNext self._shapes[str(t)]['shape'] = new_shape KeyError: '0'