Error: Exception has been thrown by the target of an invocation - when adding Availability data for volunteers

When adding or editing Availability data on a volunteer constituent record, users may receive the error:

Exception has been thrown by the target of an invocation.

Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch. 

Environment

 3.0.516, patch 9
 3.0.516, Service Pack 4

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