TestStand Error -17801: Unknown Interface ID

Updated Jul 31, 2023

Reported In

Software

TestStand
LabVIEW

Issue Details

I am using TestStand to call a LabVIEW VI that has a Waveform Parameter. When I try to call the VI, I get Error Code: -17801; Unknown Interface ID. How do I fix this error?

Solution

This error usually occurs if you uninstall LabVIEW but leave a different version installed. It also can occur after a windows update.
To fix the problem, you will need to repair your LabVIEW installation.

Windows Control Panel
1. Go to Settings » Control Panel » Add or Remove Programs.
2. Choose National Instruments Software and click Change/Remove.
3. Choose the version of LabVIEW that is still installed, and click Repair.
Reinstalling the LabVIEW:
1. Uninstall the software in question
2. Download and re-install the software in question
Now in NI Package Manager, you can also repair the LabVIEW, please refer to the instruction:
1. Repair Software In NI Package Manager (NIPM)

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