change line 25:
$WA_MailObject = WAUE_AddAttachment($WA_MailObject,"".$WA_DFP_UploadStatus["WA_UploadResult1"]["serverDirectory"] ."".$_SESSION[''] ."?php echo $WA_DFP_UploadStatus[\"WA_UploadResult1\"][\"serverFileName\"]; ?>");
to:
$WA_MailObject = WAUE_AddAttachment($WA_MailObject,"".$WA_DFP_UploadStatus["WA_UploadResult1"]["serverDirectory"] ."".$WA_DFP_UploadStatus["WA_UploadResult1"]["serverFileName"]."");