I tried to reply by email and it was blocked for some reason, so trying 
again...

You need to add this code somewhere (maybe converted to Python) to make sure
the correct MEL scripts have been sourced.

if (!`exists artBlendShapeSelectTarget`) {
    // *Properties.mel and *Values.mel are MEL scripts to fill in the tool 
settings window for a context.
    // The MEL proc you're looking for is defined in one of those files, 
but none of it has been sourced yet
    // so Maya doesn't yet have it available.  Source the *Properties file 
and it should source all the other
    // files you need.
    source artAttrBlendShapeProperties;
}

-Tim

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