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The new version of the classroom of Android Education Online School has been deleted and downloaded, so it can't be opened.
The following reasons may occur:

1 Maybe the app server is under maintenance, try again later, or the system version is incompatible, and report it to customer service.

Maybe the mobile phone network is not smooth. Recommend reconnecting.

There is something wrong with the download, just delete it and download it.

None of the above, try shutting down and restarting.