Error 349 in Google Chrome browser when viewing or uploading .PDF files

Hi pals,
What is causing the following Error 349 in Google Chrome browser when viewing or uploading .pdf files?
"Duplicate headers received from server
The response from the server contained duplicate headers. This problem is generally the result of a misconfigured website or proxy. Only the website or proxy administrator can fix this issue.
Error 349 (net::ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION): Multiple Content-Disposition headers received. This is disallowed to protect against HTTP response splitting attacks"
I don't know how to tackle this.
Please help.
