Error Message won't disapear

[Google Calendar] Das Hochladen von Elementen auf den Server in Ordner ‘WL-VK/Aufgaben’ ist fehlgeschlagen mit folgendem Fehler: Not Found

I would suggest to try repairing your Google Calendar.

(To Repair Google Calendar in eM Client).

Click the Calendar icon at the bottom left of eM Client.

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Then “Right click” your “Gmail Calendar” and “Click Properties” at the bottom

Next click the “Repair” tab at the top and finally click “Repair”. This will take time as eM Client has to rebuild the local calendar cache etc