We apologize for the inconvenience, this is currently a known issue. The team is currently working on a fix that should mitigate the issue as soon as possible.

To help our moderators and developers collect more information on this issue, please report this bug at: https://bugs.mojang.com/secure/Dashboard.jspa.

Thank you for your patience while we work on the solution!

Best Regards,

Fae Witch
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	Talibasker1 May 29, 2021, 6:03 AM PDT I tried many times but still same message show and my world has many created spawner not work Pls check my account what is the problem.   I don't want delete my world because I tired doing it.

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	Fae Witch (Minecraft Help) May 29, 2021, 4:25 AM PDT Hey there,

As of update 1.16.20, it is a known but temporary issue for players to receive "an error has occurred" after attempting to upload a world to their Realms, even if the upload is successful.

Please try your upload again and join your Realm; it should load into the world you uploaded.

For more information, you may view the bug report for this issue at Bug report 474.

Best Regards,

Fae Witch
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	Talibasker1 May 29, 2021, 3:32 AM PDT Hi My realm world have many promblem with spawners and when i replace the world with saved copy there is error message show after the initializing upload screen. Pls check it