Dear all,

I am trying to run the ABPS plugin with PyMOL Version on Ubuntu 12.10. I have compiled pymol from source (

When running the plugin, I can set the grid, but after clicking on Run APBS, I get the following error:

Unexpected error: (<type 'exceptions.ImportError'>, ImportError('No module named pdb2pqr.pdb2pqr',), <traceback object at 0x7fd130771200>)
<type 'exceptions.UnboundLocalError'> Exception in Tk callback
  Function: <function <lambda> at 0x7fd13078e398> (type: <type 'function'>)
  Args: ()
Traceback (innermost last):
  File "/usr/lib/python2.7/dist-packages/Pmw/Pmw_1_3/lib/", line 1747, in __call__
    return apply(self.func, args)
  File "/usr/lib/python2.7/dist-packages/Pmw/Pmw_1_3/lib/", line 153, in <lambda>
    command=lambda self=self, name=name: self._doCommand(name))
  File "/usr/lib/python2.7/dist-packages/Pmw/Pmw_1_3/lib/", line 132, in _doCommand
    return command(name)
  File "/home/pymol-svn/modules/pmg_tk/startup/", line 1036, in execute
    good = self.generatePqrFile()
  File "/home/pymol-svn/modules/pmg_tk/startup/", line 1007, in generatePqrFile
    good = self._generatePdb2pqrPqrFile()
  File "/home/pymol-svn/modules/pmg_tk/startup/", line 1615, in _generatePdb2pqrPqrFile
    if retval != 0:
<type 'exceptions.UnboundLocalError'>: local variable 'retval' referenced before assignment

The first line suggests that the pdb2pqr module cannot be loaded. However, the grid seems to be set okay. Has anybody encountered this error before and knows how to solve it?

I have also tried the pymol version that can be installed with apt-get, but same error.

Thanks for any advice!

Best wishes, Tobias.