By default error message is not shown, when you see “An internal error has occurred while processing your request.”, you can enable Debug to get more information about the PHP error. (Make sure you follow the docs to set up the related advanced settings and php.ini settings.)
Under the PHP → General Options → Logging tab in the UI, specify the Log files folder (e.g "log/"
) which is relative to your project folder.Generate config.php and run your web application again, then you may check the error log under the Log file folder you specified.