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Error -1237 when unassigning a resource using the COM API

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Symptoms

The following error is reported in API logs :

11:15:54 AM Level5: Warning: Please check COM API logs for more details.

11:15:55 AM Level2: Error: Number= -1237 Message= The resource cannot be unassigned. Unable to unassign resource: {Guid}

Reason

The resource is already unassigned.

Resolution

You can adapt your code to prevent unassignment for these resources or ignore such errors as the resource is already unassigned.