Subversion encountered an error: svn: Working copy '/mnt/upload6/private/ExtensionDistributor/mw-snapshot/trunk/extensions' locked svn: run 'svn cleanup' to remove locks (type 'svn help cleanup' for details)
Topic on Extension talk:Wiki Object Model
I had same with PrivatePageProtection extension. Got around it by downloading using SVN from command line:
svn checkout http://svn.wikimedia.org/svnroot/mediawiki/trunk/extensions/PrivatePageProtection