Error 1 occurred at Invoke Node in openvi.vi

[presun]

Hello,  in openvi.vi, I use Invoke Node to run showchannel2.vi,  I met problem about error 1. please see attachment file.

This problem have been described below absolutely.  

Error 1 occurred at Invoke Node in openvi.vi

Possible reason(s):

LabVIEW:  An input parameter is invalid.
---
NI-488:  Command requires GPIB Controller to be Controller in Charge.

I don't know why? How can I overcome this question?

Thank you very much 

[smercurio_fc · Accepted solution]

The datatypes of your controls don't match. In the subVI you have a U8. In the parent VI the slider is a DBL. Change the slider's datatype to a U8. You should also make sure you have a valid range on your slider. In the subVI you're subtracting 8 from the input value, so it seems you're wanting a control with a minimum value of 8.