ID:251007 Can't recognize <text> as a legal <parameter name>=<value> assignment -- specify a legal parameter assignment

CAUSE: You attempted to edit an assignment in the Assignment Editor and the assignment requires that you specify a legal parameter assignment, but the Quartus Prime software does not recognize the specified value. The Quartus Prime software cannot accept illegal values. If a previous legal value exists, the Quartus Prime software will revert to the previous assignment value.

ACTION: Change the value of the assignment so that the parameter assignment is legal. Parameter assignments have the form: <parameter name>=<value>