2.6.9joplin sync problem

When i update my joplin to 2.6.9 joplin server(beta) report error:

Error 412 Precondition Failed: <!doctype html> Joplin Server - Error

onDocumentReady(function() { const buttons = document.getElementsByClassName('close-notification-button'); for (const button of buttons) { button.addEventListener( (Code 412)

You need to upgrade the server to 2.6+

thank you

I tried all kinds of methods, but there was no solution. Finally, I removed my docker and reinstalled Joplin server!
it works.

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