Jan 09, 2017 - 02:11 AM
Difficult to help without seeing the case. I assume this is a black-box module. Do you have any control signals on your canvas that are close to the module graphic? I have seen this error when a control signal comes close to the graphic of a black-boxed module. Try giving the module as much space as possible, and make sure you didn't paste it on top of another signal.
Hope this helps,