How can I change the Html Source code in Javascript for my Html component?

We found the source of the problem. Thank you.

It still doesn't load, the name of the app is "Loveland Calendar", the start page is called MyClubs but the page that won't load is called mainPage. We shared the app with support.

After changing the name of two pages on my app it did not work giving me "no page found" once published, changed the names back and now one of the pages will not load.