ID:13038 Illegal configuration of the instance "<name>" of IO primitive ALT_IOBUF. Port "io" should be connected to a bidirectional pin, not to an output pin.

CAUSE: The specified ALT_IOBUF has its "io" port connected to an output pin. This is illegal. The port should be connected to a bidirectional pin.

ACTION: Either connect the "io" port of the specified ALT_IOBUF to a bidirectional pin, or use ALT_OUTBUF or ALT_OUTBUF_TRI primitive instead and connect its "o" port to the output pin.