Store SNP step returns an Error

[maxpletner]

One of the students at S1000 has discovered such a bug during the lab with the VNA Simulator.

2023-06-26 17:05:16.732432 ; TestPlan ; Error ; Error running "Store SNP": Object reference not set to an instance of an object..
2023-06-26 17:05:16.732432 ; TestPlan ; Debug ; NullReferenceException: Object reference not set to an instance of an object.
2023-06-26 17:05:16.732432 ; TestPlan ; Debug ; at OpenTap.Plugins.PNAX.LMS.StoreSnpAdvanced.Run()
2023-06-26 17:05:16.732432 ; TestPlan ; Debug ; at OpenTap.TestStepExtensions.DoRun(ITestStep Step, TestPlanRun planRun, TestRun parentRun, IEnumerable1 attachedParameters) 2023-06-26 17:05:16.732432 ; TestPlan ; Debug ; Exception caught at: 2023-06-26 17:05:16.732432 ; TestPlan ; Debug ; at failState execTestPlan(OpenTap.TestPlanRun, System.Collections.Generic.IList1[OpenTap.ITestStep])
2023-06-26 17:05:16.732432 ; TestPlan ; Debug ; at OpenTap.TestPlanRun DoExecute(System.Collections.Generic.IEnumerable1[OpenTap.IResultListener], System.Collections.Generic.IEnumerable1[OpenTap.ResultParameter], System.Collections.Generic.HashSet1[OpenTap.ITestStep]) 2023-06-26 17:05:16.732432 ; TestPlan ; Debug ; at OpenTap.TestPlanRun executeInContext(System.Collections.Generic.IEnumerable1[OpenTap.IResultListener], System.Collections.Generic.IEnumerable1[OpenTap.ResultParameter], System.Collections.Generic.HashSet1[OpenTap.ITestStep])
2023-06-26 17:05:16.732432 ; TestPlan ; Debug ; at Void g()
2023-06-26 17:05:16.732432 ; TestPlan ; Debug ; ...
2023-06-26 17:05:16.732432 ; TestPlan ; Information ; "Store SNP" completed with verdict 'Error'. [2.47 ms]

All licenses are fine, the log file is attached.
It's the only time we've found such an issue - still requires some attention.
The VNA Offline Simulator has a previous FW version.
Old: A.17.05.08
New: A.17.19.16 - it solved the issue
SessionLog 2023-06-26 16-59-31.txt

[AsgerIversen]

I think I ran into this yesterday during a demo.

SessionLogs-2026-04-08-13_23_03.log

The AI really likes to put that "Store SNP" step into test plans, and then it gets all confused about this error.

[noxdk]

These are two different scenarios of a NullReferenceException. I have created a PR that fixes the one @maxpletner experienced. The one you experienced @AsgerIversen was not really a bug in this plugin itself, but it could be hard for the end user to find out what is wrong. I have added a possible explanation of what to do in this case.

The PR also enables querying for errors if an exception is thrown when doing a SCPI query.