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Error 'Unable to add cookies, header already sent.' after re-uploading files?

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  • Error 'Unable to add cookies, header already sent.' after re-uploading files?

    I just re-uploaded the vB files and now I see this number appearing in the top left corner along with an 'Unable to add cookies, header already sent.' error.

    See screenshot.
    Attached Files

  • #2
    Ok I just discovered this number is included at the top of every file when I donwload them from


    • #3
      To troubleshoot this, first reupload all the original vB non-image files (except install.php). Make sure you upload these in ASCII format and overwrite the ones on the server. Also be sure to upload the admincp files to whichever directory you have set in your config.php file. Then run 'Suspect File Versions' in Diagnostics to make sure you have all the original files for your version and that none show 'File does not contain expected contents':

      Admin CP -> Maintenance -> Diagnostics -> Suspect File Versions

      [Note: In some cases you may also need to remove any of the listed .xml files in the includes/xml directory.]

      Next, disable all products (except vB Blog and vB CMS if you are running the Suite.)

      Admin CP -> Plugins & Products -> Manage Products -> Disable

      Then manually uncheck all plugins that are not for 'vBulletin Blog' and vBulletin CMS' here:

      Admin CP -> Plugins & Products -> Plugin Manager

      You must do BOTH of those steps in order to disable all non vBulletin Modifications.

      Then if you still have this problem, create a new style and choose no parent style. This will force it to use the default templates. Finally empty your browser cache, close all browser windows then try again. Make sure you change to the new style and view your forums with it.

      Do you have the same problem?
      Steve Machol, former vBulletin Customer Support Manager (and NOT retired!)
      Change CKEditor Colors to Match Style (for 4.1.4 and above)

      Steve Machol Photography

      Mankind is the only creature smart enough to know its own history, and dumb enough to ignore it.


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