ID:275042 Bidirectional pin "<name>" is missing source

CAUSE: In a Graphic Design File (.gdf), the specified bidirectional pin is connected to a named signal, but the named signal has no source other than the specified bidirectional pin. Each bidirectional pin must be connected to a source signal.

ACTION: Connect the bidirectional pin in the design to a source signal, or delete the bidirectional pin if it is not used.