Error :Unrecognized token 'he6l' was found

Hi ,

Requirement is to attach a pdf file from PC and mail it to a fax server.

i have used FM GUI_UPLOAD to extract the contents of the file.

i have used FM SO_DOCUMENT_SEND_API1 to attach the contents and mail it to a fax server.

in my SAP OUTBOX , i can view the PDF faxed.

when i try to open the PDF, i can view the contents faxed .

for some PDF i get a information " An unrecognized token 'he6l' was found" and i just find blank pages.

please let me know how to solve this.