Critical Error

SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected (SQL: select * from `tblconfiguration`)

PDOException: SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected in /www/wwwroot/client.iithost.com/vendor/illuminate/database/Connection.php:331
Stack trace:
#0 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Connection.php(331): PDO->prepare()
#1 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Connection.php(664): Illuminate\Database\Connection->Illuminate\Database\{closure}()
#2 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Connection.php(631): Illuminate\Database\Connection->runQueryCallback()
#3 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Connection.php(339): Illuminate\Database\Connection->run()
#4 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Query/Builder.php(2202): Illuminate\Database\Connection->select()
#5 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Query/Builder.php(2190): Illuminate\Database\Query\Builder->runSelect()
#6 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Query/Builder.php(2685): Illuminate\Database\Query\Builder->Illuminate\Database\Query\{closure}()
#7 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Query/Builder.php(2191): Illuminate\Database\Query\Builder->onceWithColumns()
#8 /www/wwwroot/client.iithost.com/vendor/whmcs/whmcs-foundation/lib/Config/Setting.php(0): Illuminate\Database\Query\Builder->get()
#9 /www/wwwroot/client.iithost.com/vendor/whmcs/whmcs-foundation/lib/Application.php(0): WHMCS\Config\Setting::allAsArray()
#10 /www/wwwroot/client.iithost.com/vendor/whmcs/whmcs-foundation/lib/Application.php(0): WHMCS\Application->loadAdminDefinedConfigurations()
#11 /www/wwwroot/client.iithost.com/vendor/whmcs/whmcs-foundation/lib/Application/ApplicationServiceProvider.php(0): WHMCS\Application->__construct()
#12 /www/wwwroot/client.iithost.com/vendor/illuminate/container/Container.php(801): WHMCS\Application\ApplicationServiceProvider->WHMCS\Application\{closure}()
#13 /www/wwwroot/client.iithost.com/vendor/illuminate/container/Container.php(687): Illuminate\Container\Container->build()
#14 /www/wwwroot/client.iithost.com/vendor/illuminate/container/Container.php(633): Illuminate\Container\Container->resolve()
#15 /www/wwwroot/client.iithost.com/vendor/illuminate/container/Container.php(1280): Illuminate\Container\Container->make()
#16 /www/wwwroot/client.iithost.com/vendor/illuminate/support/Facades/Facade.php(198): Illuminate\Container\Container->offsetGet()
#17 /www/wwwroot/client.iithost.com/vendor/illuminate/support/Facades/Facade.php(166): Illuminate\Support\Facades\Facade::resolveFacadeInstance()
#18 /www/wwwroot/client.iithost.com/vendor/whmcs/whmcs-foundation/lib/Application/Support/Facades/Facade.php(0): Illuminate\Support\Facades\Facade::getFacadeRoot()
#19 /www/wwwroot/client.iithost.com/init.php(0): WHMCS\Application\Support\Facades\Facade::self()
#20 /www/wwwroot/client.iithost.com/submitticket.php(0): unknown()
#21 {main}
Next Illuminate\Database\QueryException: SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected (SQL: select * from `tblconfiguration`) in /www/wwwroot/client.iithost.com/vendor/illuminate/database/Connection.php:671
Stack trace:
#0 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Connection.php(631): Illuminate\Database\Connection->runQueryCallback()
#1 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Connection.php(339): Illuminate\Database\Connection->run()
#2 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Query/Builder.php(2202): Illuminate\Database\Connection->select()
#3 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Query/Builder.php(2190): Illuminate\Database\Query\Builder->runSelect()
#4 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Query/Builder.php(2685): Illuminate\Database\Query\Builder->Illuminate\Database\Query\{closure}()
#5 /www/wwwroot/client.iithost.com/vendor/illuminate/database/Query/Builder.php(2191): Illuminate\Database\Query\Builder->onceWithColumns()
#6 /www/wwwroot/client.iithost.com/vendor/whmcs/whmcs-foundation/lib/Config/Setting.php(0): Illuminate\Database\Query\Builder->get()
#7 /www/wwwroot/client.iithost.com/vendor/whmcs/whmcs-foundation/lib/Application.php(0): WHMCS\Config\Setting::allAsArray()
#8 /www/wwwroot/client.iithost.com/vendor/whmcs/whmcs-foundation/lib/Application.php(0): WHMCS\Application->loadAdminDefinedConfigurations()
#9 /www/wwwroot/client.iithost.com/vendor/whmcs/whmcs-foundation/lib/Application/ApplicationServiceProvider.php(0): WHMCS\Application->__construct()
#10 /www/wwwroot/client.iithost.com/vendor/illuminate/container/Container.php(801): WHMCS\Application\ApplicationServiceProvider->WHMCS\Application\{closure}()
#11 /www/wwwroot/client.iithost.com/vendor/illuminate/container/Container.php(687): Illuminate\Container\Container->build()
#12 /www/wwwroot/client.iithost.com/vendor/illuminate/container/Container.php(633): Illuminate\Container\Container->resolve()
#13 /www/wwwroot/client.iithost.com/vendor/illuminate/container/Container.php(1280): Illuminate\Container\Container->make()
#14 /www/wwwroot/client.iithost.com/vendor/illuminate/support/Facades/Facade.php(198): Illuminate\Container\Container->offsetGet()
#15 /www/wwwroot/client.iithost.com/vendor/illuminate/support/Facades/Facade.php(166): Illuminate\Support\Facades\Facade::resolveFacadeInstance()
#16 /www/wwwroot/client.iithost.com/vendor/whmcs/whmcs-foundation/lib/Application/Support/Facades/Facade.php(0): Illuminate\Support\Facades\Facade::getFacadeRoot()
#17 /www/wwwroot/client.iithost.com/init.php(0): WHMCS\Application\Support\Facades\Facade::self()
#18 /www/wwwroot/client.iithost.com/submitticket.php(0): unknown()
#19 {main}