1074130544 Session Handle is not Valid goes away in Highlight Execution

[Phteven_722]

I'm trying to use 2 PXI-4312 SMUs in a VI using the niDCPower drivers. When I try to run the VI normally, both SMUs show the following error: "niDCPower Configure Output Enabled.vi<ERR>IVI: (Hex 0xBFFA1190) The session handle is not valid"

However, when I run the VI with Highlight Execution selected, it runs without any errors. If I wait the first 3 cases in the case structure execute and then turn off highlight execution, it will also run without errors.

Does anyone have any suggestions on how to debug this?

I have attached the VI. I am using LabVIEW 2019

[crossrulz · Accepted solution]

Local Variables!  You don't need them.  Use Wires instead.

What is happening here is you have a race condition between when the loop gets to the first time it reads the resource variable to when your initialization completes and writes the local variable.  As GerdW will state: THINK DATAFLOW!  Use wires to pass your data around.

[Phteven_722]

That solved it. Thanks