Error CMP424: The CLK0 pin of the ngmux instance <instance name> must be driven by only CLKBUF/CLKDIVDLY/CLKDLY/PLL/CLKINT/CLKSRC.

The instance at the CLK0 input of NGMUX must be placable in the GLA location of the CCC.

Action

Connect the CLK0 input of NGMUX to a valid instance placable at GLA of the CCC.