Howdy Hiran -
If you have not intentionally modified the LabVIEW runtime server, I would recommend copying the original server from your "NI" to your "User" directoy. Overwrite the C:\Program Files\National Instruments\TestStand 3.5\Components\
User\RuntimeServers\LabVIEW folder with C:\Program Files\National Instruments\TestStand 3.5\Components\
NI\RuntimeServers\LabVIEW.
Let me know if you still see the error after overwritting the runtime server with the original.
Andrew W || Applications Engineer
National Instruments