LoRa Node use Arduino & SX1276-E19 crash

Dear all,
I am building LoRaWAN with loraserver.io. I use lora-gateway RAK831 with Semtech Packet Forwarder. I use Ardruino + SX1276-E19 as a node with source code (https://www.youtube.com/redirect?v=mkuS5QUj5Js&event=video_description&redir_token=X0-OCECpAUk3JLOZ9hrBexm1fLt8MTU1MzM5NTIxNkAxNTUzMzA4ODE2&q=https%3A%2F%2Fgithub.com%2Fmatthijskooijman%2Farduino-lmic). I setup system to send to TTN => OK but i change server_address at packet forwarder config file to use loraserver then the node sent a packet => crash. and someone has similar error, please help me!