Thread:Project:Support desk/Problem uploading files: Could not create directory "mwstore://local-backend/local-public/5/54".

Hello, I upgraded our wiki from 1.16 to 1.21.0rc5. I can no longer upload files. I get the error: I also get Internal errors: Error storing file in '/tmp/php2k23Xw': Could not create directory "mwstore://local-backend/local-temp/c/ca".

Backtrace:

I have tried changing ownership and permissions on all files and sub-directories and I just cannot figure out what I am doing wrong. any help would be most appreciated. Below is my installed software.
 * 1) 0 /var/www/html/wiki/includes/upload/UploadBase.php(836): UploadStash->stashFile('/tmp/php2k23Xw', 'file')
 * 2) 1 /var/www/html/wiki/includes/upload/UploadBase.php(849): UploadBase->stashFile
 * 3) 2 /var/www/html/wiki/includes/upload/UploadBase.php(858): UploadBase->stashFileGetKey
 * 4) 3 /var/www/html/wiki/includes/specials/SpecialUpload.php(332): UploadBase->stashSession
 * 5) 4 /var/www/html/wiki/includes/specials/SpecialUpload.php(425): SpecialUpload->showUploadWarning(Array)
 * 6) 5 /var/www/html/wiki/includes/specials/SpecialUpload.php(172): SpecialUpload->processUpload
 * 7) 6 /var/www/html/wiki/includes/SpecialPage.php(613): SpecialUpload->execute(NULL)
 * 8) 7 /var/www/html/wiki/includes/SpecialPageFactory.php(487): SpecialPage->run(NULL)
 * 9) 8 /var/www/html/wiki/includes/Wiki.php(291): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
 * 10) 9 /var/www/html/wiki/includes/Wiki.php(565): MediaWiki->performRequest
 * 11) 10 /var/www/html/wiki/includes/Wiki.php(458): MediaWiki->main
 * 12) 11 /var/www/html/wiki/index.php(59): MediaWiki->run
 * 13) 12 {main}


 * Installed software
 * Product 	Version
 * MediaWiki 	1.21.0rc5
 * PHP 	5.3.8 (apache2handler)
 * MySQL 	5.1.60
 * Entry point URLs
 * Entry point	URL
 * Article path	/wiki/index.php/$1
 * Script path	/wiki
 * index.php	/wiki/index.php
 * api.php	/wiki/api.php
 * load.php	/wiki/load.php