This issue typically happens when something is wrong with your region configuration. For example the subband your gateway is using is not enabled in the Chirpstack.toml file, or there is a mismatch in bands between gateway and device profile. In my case I once had this error when my gateway was configured to listen on US915_0 but the gateway bridge installed on it was sending MQTT topics with the prefix US915_1.
But without sharing your configuration files or region information there isn’t much more anyone could do to help you.