CiviCRM Community Forums (archive)

After upgrade from 4.2.6 to 4.3 I got an error 500 Internal Server Error in Drupal 7.22.
The errors I got in the Apache logs was :
PHP Fatal error:  Cannot redeclare class HTMLPurifier_Bootstrap in /public/sites/all/libraries/htmlpurifier/library/HTMLPurifier/Bootstrap.php on line 31. I solved it by disabling HTMLpurifier module in Drupal, but of course this is not meant to be like this.
Any thoughts?

Donald, thanks for prompt reply. I appreciate that very much and have a lot of respect for what you do.
Still I find it very strange that this kind of conflict with a not so exotic module (usage of 8270 according to drupal.org) does not even get mentioned in release notes or did I miss something?

Anyway, even more strange is that also the previous release had HTMLpurifier on board and no conflict there.

I suppose that if you have tried debugging this, it doesn't make sense a noob like me would try to do what you failed at. If I can help with anything...

I had this problem also.  I'm new to CiviCRM but have some experience with Drupal. Since my coding is self taught, I'm not sure that this is an acceptable solution, but I was able to keep my Drupal HTML Purifier module turned on and disable the autoload of CiviCRM's by modifying the following code in ClassLoader.php;

line 74:
    // we do this to prevent a autoloader errors with joomla / 3rd party packages
    // use absolute path since we dont know the content of include_path as yet
    // CRM-11304

    // since HTML Purifier could potentially be loaded / used by other modules / components
    // lets check it its already loaded
    // we also check if the bootstrap file exists since during install of a drupal distro profile
    // the files might not exists, in which case we skip loading the file
    // if you change the below, please test on Joomla and also PCP pages
    $includeHTMLPurifier = TRUE;
    $htmlPurifierPath = dirname(__FILE__) . '/../../packages/IDS/vendors/htmlpurifier/HTMLPurifier/Bootstrap.php';
->$drupal_HTMLPurifier = (module_exists('htmlpurifier')) ? TRUE : FALSE; // uses a drupal module check for available and enabled
    if (
      class_exists('HTMLPurifier_Bootstrap') ||
      !file_exists($htmlPurifierPath) ||
->  $drupal_HTMLPurifier
    ) {
      $includeHTMLPurifier = FALSE;
    }
    else {
      require_once $htmlPurifierPath;
    }