FANWE Database Error

The database has encountered a problem.

Error messages:

[Type] dbquery_error [1046] No database selected [Query] SELECT * FROM cron WHERE run_time <= '1566100978' ORDER BY run_time DESC

Program messages:

[Line: 0019]/www/wwwroot/coolxoo.com/shop.php(FanweService->initialize) [Line: 0058]/www/wwwroot/coolxoo.com/core/fanwe.php(initializeFanwe) [Line: 0021]/www/wwwroot/coolxoo.com/core/service/cron.service.php(FDB->query) [Line: 0210]/www/wwwroot/coolxoo.com/core/class/db.class.php(FDB->_execute) [Line: 0306]/www/wwwroot/coolxoo.com/core/class/db.class.php(FDbMySql->query) [Line: 0151]/www/wwwroot/coolxoo.com/core/class/mysql.class.php(FDbMySql->halt) [Line: 0233]/www/wwwroot/coolxoo.com/core/class/mysql.class.php(FanweError->dbError) [Line: 0125]/www/wwwroot/coolxoo.com/core/class/error.class.php(FanweError->debugBacktrace)