Cannot find instance of connector with internal name %1. If this message appears on every scheduled synchronization, the ...

Cannot find instance of connector with internal name %1. If this message appears on every scheduled synchronization, the connector may have been improperly deleted outside of the Service Manager Console.

This can only occur in exceptional conditions when the connector is deleted but its associated schedule is still active. 
The workaround to prevent this error message is to export the ServiceManager.LinkingFramework.Configuration management pack and
edit it to remove the following rules and tasks:

Rule: %1_SyncRule

Task: %1_SyncNowTask

Task: %1_DeleteTask

 and then reimporting the management pack.
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