The DataPoints in the {0} {1}' has an invalid set of {2} items. {2} names must be unique within the {2} collection for the ...

The DataPoints in the {0} ‘{1}' has an invalid set of {2} items. {2} names must be unique within the {2} collection for the DataPoint, and for this Chart's type, all of the following must be specified in the DataPoint's {2} collection: {3}.