//Attachment Entries
$WA_MailObject = WAUE_AddAttachment($WA_MailObject,"/home/abcdefg/public_html/PDF/".$row_getRecordset1['filename']."");
should be:
//Attachment Entries
$WA_MailObject = WAUE_AddAttachment($WA_MailObject,"". realpath('/home/abcdefg/public_html/PDF/'.$row_getRecordset1['filename']) . "");