Cause
The value entered in the Number of connections field of the Cable properties dialog is smaller than the actual number of cable connections of the cable.
Note:
Shields and free templates are not taken into account!
Solution
Possibility 1
Increase the value entered in the Number of connections field in the Cable Properties dialog so that it corresponds to the actual number of connections of the cable.
Possibility 2
In the Cable properties dialog next to the Type field, click [...], and when selecting parts, enter a suitable cable with the corresponding number of connections.
Refresh the connections and then start a new check run.