"I got a Mewtwo today but unfortunately I have no reason to celebrate ..."

#PokemonGO: My 8-year-old son also won the EX pass, for almost the entire week when I woke him up to go to school. The first thing he talked about was this Saturday Raid, but at the time of doing it he kept being repeatedly thrown out of the gym ... until a moment arrived that everyone could not wait and he was simply left out because of an error. I had to go home with the child crying in the car...Any tips on what can I do to avoid this error happens again?P.S. Sorry my rust english...EDIT: Here's some screenshots of the error: http://ift.tt/2yg3fgs via /r/TheSilphRoad http://ift.tt/2fZc2bB