intuitiveleap
I get this error when I attempt to use one of the pre-loaded templates on the startup screen.
Which template ?
I get errors on several templates because what they need isn't installed on my system (Sound Center, MS GS Wavetable Synth, "C:\Cakewalk Projects", etc.).
So you must be selecting a template that makes use of Pentagon, though I can't find one of mine that does.
EDIT: OK, I found it, but it's not a template, it's the Tutorial Project "Instruments Platinum.cwp".
It's probably an old example project left over from the days Pentagon was included. There's a lot of that stuff lying around.
I also get the missing Rex loop and RXP's Groove Browser in the project is completely empty.