Where <constraint_type> is multicycle, false_path, or max_delay, and <argument> is -from, -to, or -through.
The exact error message varies according to your constraint
and argument. For example:
Error in Constraint Checker: Invalid false_path constraint - the -through
port or pin list is incorrect.
The <-from OR -through OR -to> constraint argument is not valid. There are many possible reasons why the port or pin list is invalid; please consult the SDC syntax conventions for more information.
Action
Supply a valid max_delay constraint argument.