Error on 'Set Channel Value'

[zundap1970]

Hi all,

I'm using TS and VS 2016 (32 bits) with TS "add-on for test stand".

I've done a basic sequence with a Setup(  Start VS, Open Project, Open WS, Deploy on localhost) and CleanUp (Undeply, Close Ws and Close project) and run It without problem, now I've added, in Main, a Set and Get channel but in the firs call (Set) I get the error below:

Error: Error executing substep 'ChannelsSetValues'.
Invoke Node Error calling method NationalInstruments.VeriStand.ClientAPI.IWorkspace2.GetMultipleSystemNodesData, (System.ArgumentNullException: La chiave non può essere null.\r
Nome parametro: key) System.ArgumentNullException in ni-veristand-steps-runtime-lib.lvlibp:NI_VS Workspace ExecutionAPI.lvlib:NI VeriStand - Get Multiple System Nodes Data.vi->ni-veristand-steps-runtime-lib.lvlibp:ChannelsSetValues.vi->ni-veristand-steps-runtime-lib.lvlibp:ChannelsSetValues.vi.ProxyCaller
LabVIEW: A .NET exception occurred in an external assembly. For information about correcting this error, copy the following exception (in bold), and search the Microsoft Developer Network (MSDN) Web site or the Web for a possible explanation.[Error Code: 1172, User-defined error code. ]

I run VS and TS as administrator.

Thanks

[VA.KI]

Hello

Have you seen this forum?

[zundap1970 · Accepted solution]

Hello, yes I've read the forum but it wasn't helpful but naybe I've found the problem or a workaround.
Whit initial TS sequence I called the APIs :
1) Setup :Start VS, Open Project, Open WS and Deploy 
2) Clean up : Close WS, Undeploy, Close Project

The sequence above works correctly if I want only open the project but I am not able to set or get value on VS channels. Maybe the reason is due to absence of VS reference.
Now In Set up sequence I added "Open reference" API and the "Set Channel" API works

Thanks