<aspNetCore requestTimeout="23:00:00" processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" forwardWindowsAuthToken="false" stdoutLogEnabled="true" stdoutLogFile=".\logs\stdout" startupTimeLimit="3600">
then you can read the logs from that directory if you have direct access to the server, or select the latest log entries from the Log table in the database:
SELECT TOP 10 *
ORDER BY Id DESC;
Or you can configure IIS to send errors to the browser (don't do this in production).
something was probably recorded in your server's Event Viewer too, but nopCommerce's logs will probably be more helpful