.NET exception in Labview: System.ArgumentNullException 

Hi team,

I keep getting the error:

Error 1172 occurred at Property Node (Arg :1) Error accessing property Thorlabs.MotionControl.Benchtop.StepperMotorCLI.StepperMotorChannel.IsEnabled, (System.ArgumentNullException: Key cannot be null.
Parameter name: key)

Possible reason(s):

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.
System.ArgumentNullException in Kinesis.axisJHOME_PARM_SET.vi->Kinesis.stepper.vi->rxscan.main.vi

What am I missing?

Thanks