I try to run the simulation, and this instantly pops up.  Really, a problem with either the load, or the contact, or connections.  Well which is it, and it doesn't actually say that it isn't invalid.  A message like this is like being in a room full of dudes with one of them randomly bending me over and giving the business then telling me go ahead guess who it is.  I would rather have the simulation just try the run and die.  Come on what kind of information is being conveyed here other than it just doesn't want to work.  If the software has a problem with a particular item that is fair, but this is not.

Anyone know what this message is all about?