Just a thought but... Is the surface you're trying to planar map a SUB-D surface or a POLYGON surface? Current selection doesn't match required selection type usually means you're trying to do something that can't be done to that particular surface. Example... You're trying to sub-d texture a polygon. You gotta convert the poly to a sub-d first.
Dave Baer
Professor of Digital Arts
Digital Media Arts College
Boca Raton, Florida
dbaer@dmac.edu