I also get this error when i try to drag components, but for me this was not the solution, after some time i found what was the problem, so maybe if anyone gets this error it might help.
I have higher assembly where i have all assemblies and lower assemblies where are parts
Higher assembly is made of more lower assemblies, which means that higher assembly is the final assembly.
I made this error because i moved the part in lower ***. that contains mechanism in higher ***., but i moved it out of mechanism range - PIN like (0° - 180°) - mechanism range, but i moved it in lower assembly over 180 degrees and left it in that position.
I was geeting this error because my mechanism was no longer connected, if you get this error just simply delete the mechanism (cam), it might help.
My english is not wery good, i hope you understand me what am i trying to say