I can run Dock Prep on a PDB file containing zinc (1zip) without the problem you're getting.  Can you tell me what PDB you're using, and what version of Chimera?

--Eric

                        Eric Pettersen

                        UCSF Computer Graphics Lab

                        pett@cgl.ucsf.edu

                        http://www.cgl.ucsf.edu


On Oct 8, 2007, at 10:54 AM, zzj wrote:

Hi there,
I am preparing dock6 files in Chimera using the Dockprep option. The
Zn and K ions in the PDB files are giving me problems at the point of
adding hydrogen. Everthing works fine if I remove these ion atoms.
Here is the Chimera Error message:
AttributeError: addHinfoDialog instance has no attribute "cancerlCB".
I can select and highlight these ions without problem. I tried to give
different names for the ions. Nothing worked.
Any suggestion is highly appreciated!
-Joe
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