Duplicate headers received from server

[TemplateTonic]

After loading a test text file as a download attribute, and placing a dummy order when I made it free I then marked it as processing and went back to my success checkout, hit refresh and it was available.

When I clicked download I got an error via Chrome saying:

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 346 (net::ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_LENGTH): Multiple distinct Content-Length headers received. This is disallowed to protect against HTTP response splitting attacks.

What does this mean? How can I fix?

[Songbird]

I just had Zen Cart added to my site and unfortunately before we went live with it, the version 1.5 came out and my web designer upgraded to the new version. I am getting the same error on Chrome. I get a "HTTP 400 Bad Request The Web Page Cannot be Found" Error using IE, and with Firefox I get a "Corrupt Content" Error. The web designer upgraded on his server and was able to download without problems.

Any help on this would be great as I would love to be able to open the new cart sooner than later!

[TemplateTonic]

Chrome screen: http://templatetonic.com/ipage.jpg

[Songbird]

Hi Template Tonic, I wonder if we need to post this again somewhere else as no one seems to want to answer here!

[Kim]

Do not repost. If you have more details it would help the experts to diagnose your problem.

[RescoCCC]

Applicable tutorial:

https://www.zen-cart.com/tutorials/index.php?article=87

[Songbird]

I am new to Zen Cart. My webmaster installed version 1.3.9 on my site. I uploaded all my downloads and set up everything on my end. I did a test sale and everything went through fine until I tested the download link. I then got the following error. I can't get my Zen Cart store up and running until I can get this resolved. I am using Chrome. However, I get error messages with Firefox and IE also. IE was http 400 bad request. Please help!

Oops should have added that he upgraded to 1.5 after I had set up everything.