Snippets killed business server - 404 - file not found for file xas

We are converting our Mendix 4 app to Mendix 5.9.1 and all seems okay, until we convert Formloader widgets to Snippets this happens: EventAdmin: Exception during event dispatch [org.osgi.service.event.Event [topic=com/mendix/events/runtime/beforeRunning] | [org.osgi.service.event.EventHandler] | Bundle(webui [90])] (bundle: webui, service: [org.osgi.service.event.EventHandler]) This has happened twice now. Each time we reverse merge our commits to get to a stable point, re-apply the treatment of removing formloader widgets and replacing them with Snippets and then this happens again. It happened on 2 different accounts using different computers.
1 answers

It appears that there was 1 widget on 1 snippet that caused this. The odd thing is, our work around wasn't related to any UI changes we made, but in the Domain model on a persistent entity's attribute.

We renamed an attribute and then our problem went away. We rename it back and the problem comes back. Very strange indeed.