The script, wacomcpl, can't find the file (or files) that are necessary. Either that or the script was incorrectly written. The script's trying to find the LIBWACOMXI files, which I'm guessing are the libwacomxi.so files. They're in /usr/lib/tcl8.6/TkXInput. However, even when the script is changed to use this directory it still can't find them.
*after some fiddling*
I have been able to get wacomcpl to work. I rebuilt the linuxwacom RPM and placed the TkXInput files it builds in /usr/lib/TkXInput. What's interesting is that the tkxinput package in Synaptic doesn't place its files in /usr/libTkXInput.
I don't know if this will solve the problem, but I'll drop this in TexStar's box and see what he says.