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[Matze1116]

What an I do ?

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[solracsf]

Start to check #23369

[kesselb]

Thank you for reporting this issue 👍 Please check #15058 for more details.

Usually there are two ways to fix this:

A) Configure your database server to support utf8mb4 (https://docs.nextcloud.com/server/latest/admin_manual/configuration_database/mysql_4byte_support.html).

B) If the database server does not support utf8mb4 disable it by setting 'mysql.utf8mb4' => false in your config.php (emojis in filename, calendar events, etc. are not possible than and you have to accept the warning).