Restored models for Objects of Basic Actions are None

[yazan.abbas@…]

The following bug report has been submitted:
Platform:        Linux-4.15.0-54-generic-x86_64-with-debian-stretch-sid
ChimeraX Version: 0.91 (2019-07-10)
Description
(Describe the actions that caused this problem to occur here)

Log:
UCSF ChimeraX version: 0.91 (2019-07-10)  
© 2016-2019 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open /home/yazan/Dropbox/Abbas_etal_2019_brainV-
ATPase/Figures/Figure3/Figure3_1.cxs

Unable to restore session, resetting.  
  
Traceback (most recent call last):  
File "/usr/lib/ucsf-chimerax-daily/lib/python3.7/site-
packages/chimerax/core/session.py", line 629, in restore  
obj = sm.restore_snapshot(self, data)  
File "/usr/lib/ucsf-chimerax-daily/lib/python3.7/site-
packages/chimerax/basic_actions/statemgr.py", line 65, in restore_snapshot  
cmd.name_frozen(session, name, Objects(**value))  
File "/usr/lib/ucsf-chimerax-daily/lib/python3.7/site-
packages/chimerax/core/objects.py", line 53, in __init__  
{ m:m.triggers.add_handler("deleted", self._model_deleted_cb) for m in
self._models })  
File "/usr/lib/ucsf-chimerax-daily/lib/python3.7/site-
packages/chimerax/core/objects.py", line 53, in <dictcomp>  
{ m:m.triggers.add_handler("deleted", self._model_deleted_cb) for m in
self._models })  
AttributeError: 'NoneType' object has no attribute 'triggers'  
  
Error processing trigger "deleted": 'Objects' object has no attribute
'_handlers':  
AttributeError: 'Objects' object has no attribute '_handlers'  
  
File "/usr/lib/ucsf-chimerax-daily/lib/python3.7/site-
packages/chimerax/core/objects.py", line 73, in _model_deleted_cb  
del self._handlers[model]  
  
See log for complete Python traceback.  
  
Summary of feedback from opening /home/yazan/Dropbox/Abbas_etal_2019_brainV-
ATPase/Figures/Figure3/Figure3_1.cxs  
---  
note | Traceback (most recent call last):  
  
File "/usr/lib/ucsf-chimerax-daily/lib/python3.7/site-
packages/chimerax/core/session.py", line 629, in restore  
  
obj = sm.restore_snapshot(self, data)  
  
File "/usr/lib/ucsf-chimerax-daily/lib/python3.7/site-
packages/chimerax/basic_actions/statemgr.py", line 65, in restore_snapshot  
  
cmd.name_frozen(session, name, Objects(**value))  
  
File "/usr/lib/ucsf-chimerax-daily/lib/python3.7/site-
packages/chimerax/core/objects.py", line 53, in __init__  
  
{ m:m.triggers.add_handler("deleted", self._model_deleted_cb) for m in
self._models })  
  
File "/usr/lib/ucsf-chimerax-daily/lib/python3.7/site-
packages/chimerax/core/objects.py", line 53, in <dictcomp>  
  
{ m:m.triggers.add_handler("deleted", self._model_deleted_cb) for m in
self._models })  
  
AttributeError: 'NoneType' object has no attribute 'triggers'  
  
  
  
During handling of the above exception, another exception occurred:  
  
  
  
Traceback (most recent call last):  
  
File "/usr/lib/ucsf-chimerax-daily/lib/python3.7/site-
packages/chimerax/core/triggerset.py", line 130, in invoke  
  
return self._func(self._name, data)  
  
File "/usr/lib/ucsf-chimerax-daily/lib/python3.7/site-
packages/chimerax/core/objects.py", line 73, in _model_deleted_cb  
  
del self._handlers[model]  
  
AttributeError: 'Objects' object has no attribute '_handlers'  
  
  
  
  
opened ChimeraX session  




OpenGL version: 3.3.0 NVIDIA 418.56
OpenGL renderer: GeForce RTX 2070/PCIe/SSE2
OpenGL vendor: NVIDIA Corporation

[Greg Couch]

Can you tell me how to reproduce this bug? I tried by starting the Basic Actions tool, opening a structure, creating a frozen named selection, and saving the session. But it successfully restored, so clearly it's not that simple.

If you're willing attach the problematic session file, I can use that to figure out how fix the symptoms. And it might give insight to fix the cause.

[Greg Couch]

No response. The guess is that this was a bug when saving the session file in an older version of ChimeraX. The current version of ChimeraX will generate the error when saving the session rather than save an unusable file.