JSON parsing in blueprints UE4

Hello, Im trying to parse JSON object, transmitting from arduino. I use plugins ue4duino: and VaRest: My algorithm works like: Read a string from serial, set it like JSON object, parse it. But it didnt work, what is wrong?
blueprints: JSONParse posted by anonymous | blueprintUE | PasteBin For Unreal Engine 4

Looks like you don’t have a target set up on the ‘Get String Field’ node. Use the ‘va’ variable as the target.

Look at this for reference:

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Thanks, It helped. I thought “set va” at the output can be used as get.