ID:176194 Differential I/O pins driven by fast PLL <name> have inconsistent location assignments

CAUSE: The Fitter tried to place the specified fast PLL. However, the differential I/O pins driven by the fast PLL have inconsistent location assignments. As a result, the Fitter could not place the fast PLL.

ACTION: Change the location assignment for the fast PLL or its differential I/O pins, or modify the design to reduce the number of differential I/O nodes driven by the fast PLL.