IVP Failed (Engine Error)

After playing Gmod for 20 minutes or so, this message appears, and gmod crashes. I’ll post more about this code later. Anyone know whats causing this?

I havent ever heard of that one… Can you Ctrl+C in the messagebox and tell us what it says?

I’m trying to do that right now.

[editline]03:43PM[/editline]

OK this is what the error message says:

IVP Failed:
Unable to locate …/IVPutil/IVP