Thread:Project:Support desk/Update script and MwEmbedSupport not working

I attempt to run the update.php script using the browser method, but I see a blank white screen with:

Fatal error: Class 'MwEmbedResourceManager' not found in [main directory]/extensions/MwEmbedSupport/MwEmbedSupport.php on line 58

Using Mediawiki 1.20.4 and the latest version of MwEmbedSupport. PHP version 5.3.28, MySQL 5.5.33-31.1. Update script at