Problems with error messages

An error occurred
Object reference not set to an instance of an object

[AirSync] An attempt to cennect to [email protected] failed. This could be caused by temporary server unavailability or incorrect settings.  Do you want to check the settings?
(When I check the settings, they work fine)

Synchronizing folder ‘[email protected]/xxxxx’s Calendar/’ failed due to the following error: The remote server returned error:(503) Server Unavailable.

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