登录禅道时提示错误已解决悬赏5积分

Fatal error: Uncaught Error: Call to a member function get() on null in D:\ZenTao\app\zentao\lib\cache\cache.class.php:908 Stack trace: #0 D:\ZenTao\app\zentao\lib\base\dao\dao.class.php(400): Zentao\Cache\cache->getByKey('daofetch33e4e5c...') #1 xx\ZenTao\app\zentao\lib\base\dao\dao.class.php(1303): baseDAO->getCache('daofetch33e4e5c...') #2 xx\ZenTao\app\zentao\framework\base\router.class.php(969): baseDAO->fetch('value') #3 D:\ZenTao\app\zentao\framework\base\router.class.php(3512): baseRouter->getInstalledVersion() #4 xx\ZenTao\app\zentao\www\index.php(43): baseRouter->checkNeedUpgrade() #5 xx\ZenTao\app\zentao\www\index.php(102): {closure}() #6 {main} thrown inD:\ZenTao\app\zentao\lib\cache\cache.class.php on line908