Analyze Gears in KISSsoft 

normally the path of contact starts from A then goes to B that is the LPSTC (Lowest point of single tooth contact) then it goes to C where you have pure rolling then to D that is the HPSTC (highest point of single tooth contact) and then it ends in the point E. The message is just saying that the point A is after the point C so there is no mesh in point C. There is no pure rolling contact in the mesh

This was a simple gear pair that I presented, if you have an example, I could try and include this as a tutorial. Otherwise, more tutorials can be located here: www.kisssoft.ch/english/downloads/instructions_kisssoft.php