Ok, so now PF3 won't even load a flight plsn!!

It says "run-time error 52: bad name or file number"
I've attached the fpl I was trying to load. But again, now I can't even load the flight plan to test; although I was having success as of late loading flight plans, as long as I did it through the default p3d flight planner.
I really want to use and like this program. But I do NOT want to run it off my main system; I want it to run over network. I am just SO frustrated with it. I tend to just give up and run RC4, because it always works, every time.
I want to stick it out and get to the bottom of this though, and find the problem. Should I re-install it again!!??
Bruce