Get device error: object does not exist

Hello,
I’m using RAK wireless RAK5176 gateway and I was able to register the gateway on chirpstack with success. Now I’m trying to get the end-node to join on the Chirpstack: Microchip SAMR34 Xplained PRO evalution kit and I’m not able to join.

The log in the Chirpstack Network Server is:
May 12 22:29:09 vladislav-HP-Laptop-15-bs1xx chirpstack-network-server[4518]: time=“2023-05-12T22:29:09.094218826-04:00” level=info msg=“uplink: frame(s) collected” ctx_id=4a68704f-0245-4a14-bea0-3277723fe12e mtype=JoinRequest uplink_ids=“[95de42f0-0b96-49a1-a0c8-3d84be4762aa]”
May 12 22:29:09 vladislav-HP-Laptop-15-bs1xx chirpstack-network-server[4518]: time=“2023-05-12T22:29:09.096706419-04:00” level=error msg=“uplink: processing uplink frame error” ctx_id=4a68704f-0245-4a14-bea0-3277723fe12e error=“get device error: object does not exist”

I’ve placed the right Device EUI and Application Key on the end node side and the chirpstack application. I just don’t know what to do now.

Does anybody have any ideas.