Hi Letizia,
Thanks for reporting the problem, though next time you might want to use the Report a Bug menu item (in the help menu).  Anyway, I will get a fix in but there's a pretty easy workaround until then:  don't blank out the "plane name" when you create the plane.  Give it some actual name (or use the default).  Just don't blank it!

--Eric

                        Eric Pettersen
                        UCSF Computer Graphics Lab
                        http://www.cgl.ucsf.edu

On Feb 3, 2015, at 9:48 AM, Letizia Meregalli <letizia.meregalli@tum.de> wrote:

Hi,
I have a tRNA molecule and I would like to measure the angles between two nitrogenous bases. I created two planes, each for each base. When I select both planes, in order to measure the angles between them (Structure Measurements Axes/Planes/Centroids) I get following message:


<type 'exceptions.UnboundLocalError'> Exception in Tk callback
  Function: <bound method SortableTable._browseCmd of <CGLtk.Table.SortableTable instance at 0x117990638>> (type: <type 'instancemethod'>)
  Args: ('1',)
Traceback (innermost last):
  File "/Applications/Chimera.app/Contents/Resources/lib/python2.7/site-packages/Pmw/Pmw_1_3/lib/PmwBase.py", line 1747, in __call__
    return apply(self.func, args)
  File "/Applications/Chimera.app/Contents/Resources/share/CGLtk/Table.py", line 1043, in _browseCmd
    self.userBrowseCmd(self.selected())
  File "/Applications/Chimera.app/Contents/Resources/share/StructMeasure/Geometry.py", line 268, in _tableCB
    self.feedback(sels)
  File "/Applications/Chimera.app/Contents/Resources/share/StructMeasure/Geometry.py", line 113, in feedback
    diff = " ".join(words2[i:])
<type 'exceptions.UnboundLocalError'>: local variable 'i' referenced before assignment

UnboundLocalError: local variable 'i' referenced before assignment

  File "/Applications/Chimera.app/Contents/Resources/share/StructMeasure/Geometry.py", line 113, in feedback
    diff = " ".join(words2[i:])

See reply log for Python traceback.



I really don’t know how can I solve this problem.. I’d be really grateful if you could help me or give me some hints!
thank you a lot

Letizia
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