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I’m afraid that’s a very generic message and we’ll need more details to help you out.
Are there any more details in your /logs or in the browser console? Does it work in safe mode?
You can also try a Command Line rebuild - which is explained here: Manually update Discourse and Docker image to latest
@nwnuyhs, checking in, did you end up figuring out what the issue was?
The reason may be that the browser was closed during the update process. Finally, use ./launcher rebuild app to solve the problem.