This error occurs on controls and indicators of LabVIEW class types if the private data control of the initial LabVIEW class includes an array without a subtype, or a nested empty cluster. The top-level cluster of the private data control can have zero elements, but nested clusters must have at least one element.

The following image displays all possible issues:

  • Empty nested cluster
  • Void array
  • Missing LabVIEW class
  • Missing type definition

To correct this error, verify that all nested clusters of the private data control have at least one element.