MQTT request to get "error" message

Hello everyone,

I am learning the LoRaWAN technology and I have one question about the MQTT request.
I manage to get datas with MQTT.
But when I have no datas because for example, “the frame counter did not increment”, I obviously have no datas. I would like to get a MQTT link to have these errors in order to store them in a file.
I tried this : “application/+/device/+/error” but it does not seem to work. Is there an MQTT link for this ?

Thanks in advance

King regards