ID:17037 Illegal configuration of I/O primitive <name>: port "<name>" should be directly connected to a single <name> pin.

CAUSE: The specified I/O primitive is illegally configured. The I/O primitive requires the mentioned port be directly connected to the specified pin.

ACTION: Correct the specified I/O primitive configuration by making the required connections. For output or bidirectional ports, this error also can occur if the port has multiple fanouts (even if one or more of the fanouts are to pins of the specified type).