Error: reading the Light meter values with Uno Read component - Firefly

Hi all,

Hopefully some of you have experience with this. I have set up a arduino Uno with a light meter. Easy set up. Reading the values from the light meter in Arduino works fine.

But the error comes when i try to read the values of the arduino with the Uno Read component of Firefly. I receive the error:

 1. Solution exception:Object reference not set to an instance of an object.

I don't have a lot of experience with figuring out these problems yet. I think it has something to do with Grasshopper not recognizing the values created by the arduino sketch. Hopefully some of you could give some advice on how i can solve this error.

Thank you,

Regards,

Remy