[Rich Sloan]
I was able to fix my Backpack error by installing (on-top of) my current installed Production Assistant 2.0. When I installed Production Assistant 2.0 it was from the original Sony CD. I believe mine was version 2.0.5 or something similar.
What I did to fix this was download the newest installer from VASST at https://vasstsoftware.com/download/
and installing version 2.0.11 of Production AssistantInstaller on top of my current install.
After installing, I started up Vegas Pro and the error went away.
Not sure this will help you but this fixed my issue. I restarted Vegas Pro several time to make sure that the Backpack error does not pop back up again.
Hopefully this helps if not, VASST answers support emails.
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FixitMad