MDErrorReporter/exceptions/page/MDpageParameterMissingException.php

<?PHP
declare(strict_types = 1);

/**
 * Custom exception class for missing page parameters.
 */
final class MDpageParameterMissingException extends Exception {
    /**
     * Error message.
     *
     * @return string
     */
    public function errorMessage() {
        //error message
        return 'Parameter: <b>' . $this->getMessage() . '</b> is required but missing.';

    }
}