My game crash when i try to join with a group

Hi all,

My game is crashing when i try to join with a group on multiplayer. It shows me "Error Code 1". I am ensure that nobody banned me in servers. And also my friend is trying to play first time. 

When I join same server alone, I can get inside. But when I am trying to send request to my friend, he can't join and error says: "Game Not Found". 

My and his game is up to date. 
Why?