If an individual bundle page is missing, this could be for several reasons.
Bundle Links Resulting in a 404 Error
This error message is usually a result of one of two reasons:
The Bundle was Deleted
If a bundle is removed from the app, it will lead to a 404 page.
The 'Proxy URL' Address Was Changed
This needs to remain as per the default setting to function correctly.
'Bundle Not Found' Message on the Bundle Page
If the bundle page loads - but shows a "Bundle not found" error - this usually happens when the bundle in the app has been deleted.