Can read gateway tags from the designer but not vision client

Ignition
1

I get this error on button click running a tag read script when on the vision client.
error doesn't occur in designer.

Traceback (most recent call last):
File "event:actionPerformed", line 1, in
java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: com.inductiveautomation.ignition.client.gateway_interface.GatewayException: at index 0

caused by ExecutionException: com.inductiveautomation.ignition.client.gateway_interface.GatewayException: at index 0
caused by GatewayException: at index 0
caused by NullPointerException: at index 0
2

We are most definitely going to need to see the script that generates this error.

3

It is just a simple
System.tag.read('tagPath).value

Works well in the designer but generates an error in the client

4

Can you supply the code? It'll help. If not, there is little we can do to help besides guess.

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