If this issue affects you, please follow up at https://github.com/ical4j/ical4j/issues/28.
Disable error message
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How can I disable the error messages. My home server is off during the day. Therefore, it would be an advantage that no error messages appear. Thank you.
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You can either activate Wifi only sync and enter your specific home wifi or you can disable all notifications for DAVdroid in Android Settings -> Apps -> DAVdroid -> Turn off notifications
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Thanks, perfect.