I've been changing little thing here and there on this model and i got a gravity only study to run, but, after i added a no penetration contact between my top I-beam and the top structural member i get this error message.

     "Surface to surface contact: Source surface/edge is not defined properly"

"Weird" i thought, so i ran an interference check

WTF?!?! "okay so maybe this only points out interfering bodies, I know!"

so there are no invalid surfaces, and no interference? is there a different tool I use to check for surface interference.