Last modified: 2011-09-21 17:38:23 UTC
After having set a new Wiki up from a freshly downloaded 1.12.0 tarball, and adding several Extensions one by one, the wikis main page is shown with MultiUpload added, but Spezial:Version yields: Fatal error: Class 'UploadForm' not found in .../extensions/MultiUpload/SpecialMultipleUpload.php on line 60 This looks like a bug at first glance. The wiki is not public atm, yet I can give you access, if you want to.
As you are using 1.12, which version of the extension did you use? You should be using the 1.12 version from r31252.tar.gz">http://upload.wikimedia.org/ext-dist/MultiUpload-MW1.12-r31252.tar.gz (if this does not work, go to http://www.mediawiki.org/wiki/Special:ExtensionDistributor and only download 1.12 extensions).
Is the issue still there with the proper extension version?
It works for me with MW 1.14 without any changes to the extension.