ID:15502 Port "<name>" of <type> PLL "<name>" cannot be implemented

CAUSE: The specified enhanced or fast PLL is using an illegal port. The port cannot be implemented in the enhanced or fast PLL or in the current operating mode. This error usually occurs when you instantiate a megafunction directly in a text file rather than using the MegaWizard Plug-In Manager .

ACTION: Remove the port from the enhanced or fast PLL.