Byte to String Package Error

Hi, I am working on a game where I want to send messages to another software (at best with json).
I was searching for the right tool/plugin and ended up with the “UDP Messaging Plugin” (GitHub - getnamo/udp-ue4: Convenience UDP wrapper for Unreal Engine 4). It is very easy to use so I was very happy. Now to my problem:
The udp message arrives as an array of Bytes. I’m converting this byte array to a string to use it.

When I package the project for win10 there occures an error.
I don’t know why this works when I play in the viewport, but does not work with packaging…

I would be very happy about any help.

More or less solved… I switched to another udp plugin. Now everything works