'Ring' object has no attribute '_c_pointer_ref'

[benjamin_weinberg@…]

The following bug report has been submitted:
Platform:        Darwin-18.7.0-x86_64-i386-64bit
ChimeraX Version: 0.9 (2019-06-06)
Description
An error occurred in drawing the scene. Redrawing graphics is now stopped to avoid a continuous stream of error messages. To restart graphics use the command "graphics restart" after changing the settings that caused the error.

Traceback (most recent call last):
File "/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/chimerax/core/updateloop.py", line 72, in draw_new_frame
view.draw(check_for_changes = False)
File "/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/chimerax/core/graphics/view.py", line 162, in draw
self._draw_scene(camera, drawings)
File "/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/chimerax/core/graphics/view.py", line 224, in _draw_scene
draw_opaque(r, opaque_drawings)
File "/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/chimerax/core/graphics/drawing.py", line 1394, in draw_opaque
_draw_multiple(drawings, renderer, Drawing.OPAQUE_DRAW_PASS)
File "/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/chimerax/core/graphics/drawing.py", line 1405, in _draw_multiple
d.draw(renderer, draw_pass)
File "/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/chimerax/core/graphics/drawing.py", line 694, in draw
if not self.display:
File "/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/chimerax/core/graphics/drawing.py", line 317, in get_display
return self._any_displayed_positions and len(self._positions) > 0
TypeError: object of type 'NoneType' has no len()



Log:
UCSF ChimeraX version: 0.9 (2019-06-06)  
© 2016-2019 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open "/Users/ben/Google Drive/Proteins/Cre structure.cxs"

opened ChimeraX session  
Traceback (most recent call last):  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/triggerset.py", line 130, in invoke  
return self._func(self._name, data)  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 2637, in
_update_graphics_if_needed  
s[i]._update_graphics_if_needed()  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 314, in
_update_graphics_if_needed  
self._create_ring_graphics()  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 500, in _create_ring_graphics  
atoms = ring.ordered_atoms  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/molc.py", line 161, in get_prop  
vcount = getattr(self, value_count)  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/molc.py", line 93, in get_prop  
cget(self._c_pointer_ref, 1, v_ref)  
AttributeError: 'Ring' object has no attribute '_c_pointer_ref'  
  
Error processing trigger "graphics update": 'Ring' object has no attribute
'_c_pointer_ref':  
AttributeError: 'Ring' object has no attribute '_c_pointer_ref'  
  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/molc.py", line 93, in get_prop  
cget(self._c_pointer_ref, 1, v_ref)  
  
See log for complete Python traceback.  
  
An error occurred in drawing the scene. Redrawing graphics is now stopped to
avoid a continuous stream of error messages. To restart graphics use the
command "graphics restart" after changing the settings that caused the error.  
  
Traceback (most recent call last):  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 72, in draw_new_frame  
view.draw(check_for_changes = False)  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/graphics/view.py", line 162, in draw  
self._draw_scene(camera, drawings)  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/graphics/view.py", line 224, in _draw_scene  
draw_opaque(r, opaque_drawings)  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/graphics/drawing.py", line 1394, in draw_opaque  
_draw_multiple(drawings, renderer, Drawing.OPAQUE_DRAW_PASS)  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/graphics/drawing.py", line 1405, in _draw_multiple  
d.draw(renderer, draw_pass)  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/graphics/drawing.py", line 694, in draw  
if not self.display:  
File
"/Applications/ChimeraX-0.9.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/graphics/drawing.py", line 317, in get_display  
return self._any_displayed_positions and len(self._positions) > 0  
TypeError: object of type 'NoneType' has no len()  
  




OpenGL version: 4.1 ATI-2.11.21
OpenGL renderer: AMD Radeon Pro 560X OpenGL Engine
OpenGL vendor: ATI Technologies Inc.

[Tom Goddard]

This was fixed on Oct 24, 2019. It is a problem with session restore of molecular rings. You are using a June 2019 ChimeraX. Get a current daily build or 0.91 candidate release for the fix.

Duplicate of #2420.