Cause

You created a plug connection with separate male and female pins in the Plug Navigator or placed it in the schematic. The plug has two plug definitions with the same DT, but different function definitions ("Plug definition for male pins" / "Plug definition for female pins"). On the male pin side of the plug there are more pins than on the female side or vice versa.

Solution

Add the corresponding pins to the male or female side of the plug, so that there is a corresponding number of male and female pins on each side.

Refresh the connections and then start a new check run.