P.S. It's your creation of the object library comp.lib with MPLIB that's failing, not any compilation.
You may not be doing what you think you're doing.
Are there multiple projects associated with last year's robot?
This isn't the normal process for compiling code to download to a robot.
How come comp.lib is referenced without the full pathname like everything else is using?
Code:
Executing: "C:\mcc18\bin\mplib.exe" /c "comp.lib"
e.g.
"R:\2008-2009\Programming\comp\comp.lib"