I don't recall what specific error was found, unfortunately.
As far as the crash goes, there is no error message, just a slight hiccup in the sim (about a 1 second stutter) followed by an immediate disappearing of all textures, terminals, etc. When I go the menu, I can see that couatl is no longer running. However P3D continues to run fine, no issues whatsoever with the sim itself, no CTDs. Just a crash of couatl.
I checked the folder you referenced and didn't see a .err file.