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Error: "Operation is not valid due to the current state of the object."
You are attempting to create a note or history, or scheduling an acvitity when you receive the following error message: "Operation is not valid due to the current state of the object."
This issue can be caused by corrupted ACT! preferences. To correct this issue, you must manually delete the ACT! preferences. Please refer to the following Knowledgebase article for assistance: