ID:15883 Signal <name> is routed on the <name> network, however there is no path to reach the specified clock network from internal logic. Modify your design so the specified signal uses a clock source of a compatible type.

CAUSE: Your design routes the specified signal to the specified network, however the signal requires the use of regular core routing and there is not a path to reach the specified clock network from internal logic.

ACTION: To drive the specified clock type, refer to the Core Fabric and General Purpose I/Os Handbook for the target device family for legal source types, and modify the design to use a clock source of a compatible type; for example, clock input pin or PLL output. If the clock signal must originate from internal logic, modify the assignments on the signal to use a different global clock type, or you can choose to not route this signal on a dedicated clock network.