I have loaded two PDB files in PyMol to pair fit some of their amino acids. When using the wizard, I'm getiing the following error. Does anyone has an idea how to solve this? 

_seeker and not _pf_s_*
Editor-Error: Invalid input.
Traceback (most recent call last):
File "C:\Program Files (x86)\DeLano Scientific\PyMOL/modules\pymol\wizard\pair_fit.py", line 147, in do_select
    cmd.edit(name + " and not " + sele_prefix + "*") # note, using new object name wildcards
File "C:\Program Files (x86)\DeLano Scientific\PyMOL/modules\pymol\editing.py", line 851, in edit
    if _self._raising(r,_self): raise pymol.CmdException
CmdException: <pymol.CmdException instance at 0x0379D378>  

Jorgen Ravoet
Molecular biologist