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 -from
port or pin list is empty.
No <–from OR -through OR -to> port or pin list has been supplied for the constraint.
Action
Enter at least one port or pin for the <-from OR -through OR -to> argument.