Uplink channel not found

Hi everyone, I am new to TTN and Heltec. I am trying to setup a gateway and at least two end nodes. Right now, I am having issues with connecting to my gateway.

For the gateway I am receiving the uplink message it then forwards it:

Forward uplink message cluster

Forward uplink message packet broker

For the end node I am then getting an error message that says:

“data”: {
@type”: “type.googleapis.com/ttn.lorawan.v3.ErrorDetails”,
“namespace”: “pkg/networkserver”,
“name”: “uplink_channel_not_found”,
“message_format”: “uplink channel not found”,

I am not sure what else I should do, as I was able to connect to this gateway a while back; I didn’t change anything. Thank you for your help in advance!