ID:15842 outclk port of the External Clock Output Clock Buffer Block "<name>" must drive output pins that share the same polarity, but the output pins <name> and <name> have different polarity

CAUSE: The outclk port of the specified Clock Control Blocks must drive output pins that share the same polarity, but the specified output pins have different polarity.

ACTION: Modify the design so that the outclk port of the specified Clock Control Block drives only output pins that share the same polarity.