ID:15500 inclk0 and inclk1 of enhanced PLL "<name>" cannot be fed by the same source

CAUSE: You specified the inclk0 and inclk1 port of the specified enhanced PLL. However, inclk0 and inclk1 port are fed by the same source. The signal that feeds the inclk0 port cannot feed the inclk1 port of the same enhanced PLL. This error usually occurs when you instantiate a megafunction directly in a text file rather than using the MegaWizard Plug-In Manager .

ACTION: Modify the design so that the signal that feeds the inclk0 port of the enhanced PLL does not feed the inclk1 port of the same enhanced PLL.