Seeing this error in arduino ide

i am seeing this error in serial monitor of arduino ide can u pls explain why?

Hi have you checked the credentials carefully and that node set to the correct mode (OTTA) or ABP in the board config for the credentials. You also need to make sure that frame counter is off or reset. Every time if using ABP. I So often make these mistakes. What gateway you using as TTIG we’re closing down after 30 second and some times missing the response , this is meant to be fixed.

do have a own gateway or how far away is the nearest gateway?