change line 138:
WA_DFP_UploadFiles("WA_UploadResult1", "".((isset($_FILES["article_imagefile"]))?$_FILES["article_imagefile"]["name"]:"") ."", "0", "", "true", $WA_UploadResult1_Params);
to:
WA_DFP_UploadFiles("WA_UploadResult1", "article_imagefile", "0", "", "true", $WA_UploadResult1_Params);