TTN Plugin Error

TTN Plugin Error

Hi all,

I have a problem with receiving data from the TTN into TagoCore.

The sensors used are Dragino LHT65, so I have installed the belonging encoder.
In the Tags section i have added the key "serial" and the dev. eui as a value.

I have attached screenshots for reference. 

Can someone assist with this error code?

Thanks for your help!
Daniel