@arlx07 It looks like you are wasting our time!
You were already advised to read the instructions in the Big LoRa32u4 boards topic.
Instead of following the instructions in that topic you tried to run other, unsuitable software for your board (for RNxxxx module which your module does not have).
Then you come back and ask for help because you don’t get that working, confusing other users with errors about RN module. And now you are asking if we recommend the ‘MCCI library’…
YES! and this was/is already documented at the start of the Big LoRa32u4 boards topic.
With the current TTS CE V3 (aka TTN V3) network you do not have (many) other options than using the MCCI LMIC library with your board.