Building a custom error page appears after an hour

I was trying to use the custom error page as documented by Mendix, but it seems that the page doesn’t appear on spot when the error happens. this is the Mendix document describing  how to do it:     my question here:  how to let the page appear on spot when the error is fetched without waiting for a certain time?   Aiham
1 answers

An update on this one, it’s working fine.. but after commiting the changes and doing a deployment , for the first time the app should stay started for up to 1 hour , then you can start testing by for example stopping the app.