Thanks for your response. Yes, I met error when saving the scenes and timeline of animation. The errors have been submitted. I also enclosed the error here in case.
File "/opt/UCSF/Chimera64-1.8/share/chimera/triggerSet.py", line 83, in invoke
self._funcData, triggerData)
File "/opt/UCSF/Chimera64-1.8/share/Animate/Session.py", line 188, in sessionSave
scPickle = pickled(scenes)
File "/opt/UCSF/Chimera64-1.8/share/Animate/Session.py", line 173, in pickled
objEncPickle = base64.b64encode(pickle.dumps(obj, protocol=2))
File "/opt/UCSF/Chimera64-1.8/share/Animate/SceneState.py", line 83, in __getstate__
pickleData['state'] = self.stateDump()
File "/opt/UCSF/Chimera64-1.8/share/Animate/SceneState.py", line 1889, in stateDump
modelID = modelsID[model]
KeyError:<Ilabel.IlabelModel object at 0x7f9bab97a5f0>