Unknown column 'wbbPosts' in 'order clause'

Fatal error: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'wbbPosts' in 'order clause'  Information:  [b]id:[/b] e71aeb93c5b09909b6ec7b7e304e658ceef678af
 [b]error message:[/b] SQLSTATE[42S22]: Column not found: 1054 Unknown column 'wbbPosts' in 'order clause'
 [b]error code:[/b] 42
 [b]sql type:[/b] wcf\system\database\MySQLDatabase
[b]sql error:[/b] Unknown column 'wbbPosts' in 'order clause'
[b]sql error number:[/b] 42S22
[b]sql version:[/b] 5.6.20
[b]sql query:[/b] SELECT user_table.userID AS objectID FROM wcf1_user user_table ORDER BY wbbPosts DESC LIMIT 30
 [b]file:[/b] D:\Programme\xampp\htdocs\dev\wcf\lib\system\database\Database.class.php (231)
 [b]php version:[/b] 5.5.15
 [b]wcf version:[/b] 2.1.0 Beta 2 (Typhoon)
 [b]date:[/b] Sat, 03 Jan 2015 15:29:54 +0000
 [b]request:[/b] /dev/cms/?memberslist/
 [b]referer:[/b] http://localhost/dev/cms/




Stacktrace: #0 D:\Programme\xampp\htdocs\dev\wcf\lib\data\DatabaseObjectList.class.php(164): wcf\system\database\Database->prepareStatement('SELECT\tuser_tab...', 30, 0) #1 D:\Programme\xampp\htdocs\dev\wcf\lib\data\user\UserProfileList.class.php(50): wcf\data\DatabaseObjectList->readObjectIDs() #2 D:\Programme\xampp\htdocs\dev\wcf\lib\page\MultipleLinkPage.class.php(151): wcf\data\user\UserProfileList->readObjects() #3 D:\Programme\xampp\htdocs\dev\wcf\lib\page\MultipleLinkPage.class.php(122): wcf\page\MultipleLinkPage->readObjects() #4 D:\Programme\xampp\htdocs\dev\wcf\lib\page\SortablePage.class.php(54): wcf\page\MultipleLinkPage->readData() #5 D:\Programme\xampp\htdocs\dev\wcf\lib\page\AbstractPage.class.php(268): wcf\page\SortablePage->readData() #6 D:\Programme\xampp\htdocs\dev\wcf\lib\page\AbstractPage.class.php(100): wcf\page\AbstractPage->show() #7 D:\Programme\xampp\htdocs\dev\wcf\lib\system\request\Request.class.php(58): wcf\page\AbstractPage->__run() #8 D:\Programme\xampp\htdocs\dev\wcf\lib\system\request\RequestHandler.class.php(125): wcf\system\request\Request->execute() #9 D:\Programme\xampp\htdocs\dev\cms\index.php(9): wcf\system\request\RequestHandler->handle('cms') #10 {main}