When I turned on "Consider warnings as errors", the following error was displayed.
Whoops\Exception\ErrorException thrown with message "Non-static method Concrete\Core\Routing\Router::route() should not be called statically"
Stacktrace:
#9 Whoops\Exception\ErrorException in /var/www/vhosts/sample.com/packages/skybluesofa_page_list_plus/controller.php:86
#8 Whoops\Run:handleError in /var/www/vhosts/sample.com/packages/skybluesofa_page_list_plus/controller.php:86
#7 Concrete\Package\SkybluesofaPageListPlus\Controller:registerRoutes in /var/www/vhosts/sample.com/packages/skybluesofa_page_list_plus/controller.php:50
#6 Concrete\Package\SkybluesofaPageListPlus\Controller:on_start in /var/www/vhosts/sample.com/concrete/src/Application/Application.php:204
#5 Concrete\Core\Application\Application:setupPackages in /var/www/vhosts/sample.com/concrete/src/Foundation/Runtime/Run/DefaultRunner.php:260
#4 Concrete\Core\Foundation\Runtime\Run\DefaultRunner:setupPackages in /var/www/vhosts/sample.com/concrete/src/Foundation/Runtime/Run/DefaultRunner.php:354
#3 Concrete\Core\Foundation\Runtime\Run\DefaultRunner:trySteps in /var/www/vhosts/sample.com/concrete/src/Foundation/Runtime/Run/DefaultRunner.php:80
#2 Concrete\Core\Foundation\Runtime\Run\DefaultRunner:run in /var/www/vhosts/sample.com/concrete/src/Foundation/Runtime/DefaultRuntime.php:102
#1 Concrete\Core\Foundation\Runtime\DefaultRuntime:run in /var/www/vhosts/sample.com/concrete/dispatcher.php:45
#0 require in /var/www/vhosts/sample.com/index.php:3
It seems that once turned on, this error occurs not only on the debug settings page, but on the entire site.