Can you help I interpret a groovy error in WebCore piston log

[stevehweb]

Hello all, I’m getting the following error in the log of one of my pistons and was wondering if there was enough information here to diagnose the issue? The piston is operating as expected, so i’m Unsure what the error means:

Thanks!

[ahndee]

Looks like you have a list of devices and call set variable on that list (which won’t work). You need to call set variable within a with Location block.

[stevehweb]

Thanks Andreas, I was not aware of that restriction for setting variables.