fatal error cause plugin not working

Fatal error: Uncaught Error: Undefined constant “YCD_TEXT_DOMAIN” in C:\xampp\htdocs\wordpress\wordpress\wp-content\plugins\expand-maker\files\ReadMoreAdminHelper.php:60 Stack trace: #0 C:\xampp\htdocs\wordpress\wordpress\wp-content\plugins\expand-maker\views\sections\aLinkCutsomOptions.php(7): ReadMoreAdminHelper::getLabelProSpan() #1 C:\xampp\htdocs\wordpress\wordpress\wp-content\plugins\expand-maker\classes\AlinkTypeReadMore.php(46): require_once(‘C:\\xampp\\htdocs…’) #2 C:\xampp\htdocs\wordpress\wordpress\wp-content\plugins\expand-maker\views\sections\livePreview.php(14): AlinkTypeReadMore->includeOptionsBlock(Object(ReadMoreData)) #3 C:\xampp\htdocs\wordpress\wordpress\wp-content\plugins\expand-maker\views\readMoreAddNewButton.php(87): require_once(‘C:\\xampp\\htdocs…’) #4 C:\xampp\htdocs\wordpress\wordpress\wp-content\plugins\expand-maker\classes\ReadMorePages.php(83): require_once(‘C:\\xampp\\htdocs…’) #5 C:\xampp\htdocs\wordpress\wordpress\wp-content\plugins\expand-maker\classes\ReadMoreInit.php(118): ReadMorePages->addNewButtons() #6 C:\xampp\htdocs\wordpress\wordpress\wp-includes\class-wp-hook.php(292): ReadMoreInit->addNewButton(”) #7 C:\xampp\htdocs\wordpress\wordpress\wp-includes\class-wp-hook.php(316): WP_Hook->apply_filters(”, Array) #8 C:\xampp\htdocs\wordpress\wordpress\wp-includes\plugin.php(484): WP_Hook->do_action(Array) #9 C:\xampp\htdocs\wordpress\wordpress\wp-admin\admin.php(259): do_action(‘read-more_page_…’) #10 {main} thrown in C:\xampp\htdocs\wordpress\wordpress\wp-content\plugins\expand-maker\files\ReadMoreAdminHelper.php on line 60
There has been a critical error on this website. Please check your site admin email inbox for instructions.