Cause

A net definition point was placed on a connection and equipped with a potential name. However, the potential is not defined at any place of the schematic.

Solution

Possibility 1

Enter the name of an existing potential definition at the net definition point.

Possibility 2

1. In the schematic define a new potential, for example by means of a potential connection point.
2. Assign the potential name of the net definition point to this connection point.

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If required, start a new check run.