<?PHP declare(strict_types = 1); /** * Exception thrown in case a library of congress subject headings link refers * to the other authority files of the Library of Congress. */ final class MDInvalidNodaLinkLcshIdIsGeneralLoc extends MDInvalidNodaLinkException { /** * Error message. * * @return string */ public function errorMessage() { //error message return 'Inputs are not valid.'; } }