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Error 538179 Object Invalidated Method Called on Interface Class in TestStand

Updated May 15, 2023

Reported In

Software

TestStand

Issue Details

I am calling two VIs in TestStand and pass reference data from one to the other. I receive
Error 538179 occurred at Transmission Data Unit.lvclass:Write ADU Packet.vi:1
Possible reason(s):
The object used has been invalidated. A method was called on an interface class.

I am able to call these two VIs in succession outside of TestStand in LabVIEW and pass the reference from one to the other using wires without issue.

Solution

The likely cause of this error is due to how the VI is being called in TestStand and how the LabVIEW class reference is being stored in TestStand:

Use the Class Member Call Call Type to call the VIs that need to pass class references between them.
Use the object reference variable to store the reference you are passing between the two VIs. You can look at Passing an Instance of a LabVIEW Class Object in the TestStand help for more details.

Additional Information

Look at the TestStand Using LabVIEW OOP Truck Example for a guide on how to pass LabVIEW Class References in a TestStand sequence.

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