Sometimes I have the same problem.
My solution is to use the georectify module to set the GPCs, save, close it and 
then run:i.group - i.target - i.rectfy.It's fail safe.

Pablo Torres Carreira




> From: [email protected]
> Date: Wed, 6 Oct 2010 09:23:17 -0400
> To: [email protected]
> Subject: [GRASS-user] help with georectify
> 
> Hi ~
> 
> GRASS 6.4.0 / OS X 10.6.4 and 10.5.8 (PPC) with wxpython
> 
> I'm having a problem with the georectify module - which is strange since I've 
> used it a lot in the past without any problems; although maybe not since I 
> upgraded to this GRASS version - hard to remember.  The module executes 
> smoothly through the selection of GCPs and will compute an rms error.  
> However, when the georectify button is activated I get an error message 
> stating that the Group does not exist.  Right above this message is a line 
> from i.points stating that the points file was saved for this group -- i.e.  
> 
> POINTS file </Users/stu/grassdata/xy2/PERMANENT/group/sheet9/POINTS> saved    
>   
> (Wed Oct  6 09:03:44 2010)                                                    
>   
> i.rectify -a group=sheet9 extension=georect64214 order=1                      
>   
> ERROR: Group <sheet9> does not exist
> (Wed Oct  6 09:03:44 2010) Command finished (0 sec)                           
>   
> 
> This looks a little like a bug that was identified last year and fixed (# 689 
> / # 709)
> 
> BTW, what is the complex 'extension' and why  is the auto-generated value so 
> 'complex'   
> 
> Thanks for any assistance .......
> 
> Stu_______________________________________________
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