I used to get that error message, and my solution, was to always "search" for a module before I install it. 
ppm> search Tk

[download]
If that doesn't work, it usually means I've used ppm3 before, which usually messes up my ppm set up, so I check, by typing 
ppm>set rep

[download]
to see what kind of repositories I have set up, and it usually tells me I have none, so I issue 
ppm>set rep default http://www.ActiveState.com/cgibin/PPM/ppmserver.pl
+ex?urn:/PPMServer

[download]
which is the default PPM package repository after which i 
ppm> search Tk

[download]
again , at which point everything is back to normal and I can safely 
ppm>install Tk

[download]
which usually ( %95 of the time ) works.

In reply to Re: Trouble installing a module using ppm. by crazyinsomniac
in thread Trouble installing Tk using ppm. by DigitalKitty

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