This sounds familiar. I think I ran into the same thing with the APBS plugin when upgrading PyMOL at one point.

On Fri, Jan 8, 2010 at 11:51 AM, Jason Vertrees <jason.vertrees@gmail.com> wrote:
Ilaria,

Which plugin are you trying to use?  Also, please beware that scripts
and plugins are different and have different methods of install.
Lastly are you using PyMOL 0.99, 1.x?

-- Jason

--
Jason Vertrees, PhD

PyMOLWiki -- http://www.pymolwiki.org



On Fri, Jan 8, 2010 at 9:21 AM, ilaria carlone
<ilariacarlone@hotmail.com> wrote:
> Hi all,
>
> I have some problems after the installation of plugins in PyMOL.
> I downloaded some plugins from the pymol wiki and copied them in the
> indicated directory (such as C:\Programs\DeLano
> Scientific\PyMOL\modules\pmg_tk\startup). I installed them by the PyMOL
> interface and restarted the program, but, after lauching PyMOL, it returned
> the following message:
>
> Traceback (most recent call last):
>   File "/home/scivis/pymol/modules/pmg_tk/PMGApp.py", line 227, in
> initializePlugins
>     mod.__init__(self)
> TypeError: module.__init__() argument 1 must be string, not instance
> Error: unable to initialize plugin (and the name of the plugin...)
>
> Can you help me? Maybe it is a trivial problem...
>
> Thanks,
>
> Ila
>
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