This error popped up today when I switched to the mobile view in edit mode. I have not yet made any changes to the mobile version but the main app is almost ready so I will be working on it soon. When I switched over, it looked fine until I put it into Live View then tried to navigate using the menu in the header. Then this message appeared on a dark screen and I was not able to switch back to the desktop view. When I refresh, I am able to get back to the desktop view. The draft published app is working as is the unedited mobile version (except the pending widgets are still showing in mobile). It seems like others have had similar errors that were resolved with updates to ExB. Is that the case here or do I need Esri support? Thanks.