Error CMP425: The CLK1 pin of the ngmux instance <instance name> must be connected to a net with only one fanout when the driver for net connected to CLK1 is placed at the GLC position.

When the driver of CLK1 is placed in the GLC position of the CCC, the connection is hardwired. The connecting net cannot have more than one driver.

Action

Remove the extra connections from the CLK1 input net.