Hey sorry that i ask here.
I edit the HumanitySystem Plugin from Dylan because it dont add People to the Groups. At beginning the Group create didn't work to.
i have the following code and dont finde the error/bug.

if(playerData.Humanity <= -2500){
                if(Convert.ToBoolean(BetterChat?.Call("API_IsUserInGroup", player.UserIDString, "hero")) == true) BetterChat?.Call("API_RemoveUserFromGroup", player.UserIDString, "hero");
                if(Convert.ToBoolean(BetterChat?.Call("API_IsUserInGroup", player.UserIDString, "neutral")) == true) BetterChat?.Call("API_RemoveUserFromGroup", player.UserIDString, "neutral");
                if(Convert.ToBoolean(BetterChat?.Call("API_IsUserInGroup", player.UserIDString, "bandit")) == true || playerData.Rank == 2) return "bandit";
                BetterChat?.Call("API_AddUserToGroup", player.UserIDString, "bandit");             
                humanityData.playerH[player.userID].Rank = 2;
                SendReply(player, lang.GetMessage("NowA", this), "bandit");     
            }
            else if(playerData.Humanity >= 2500){
                if(Convert.ToBoolean(BetterChat?.Call("API_IsUserInGroup", player.UserIDString, "bandit"))) BetterChat?.Call("API_RemoveUserFromGroup", player.UserIDString, "bandit");
                if(Convert.ToBoolean(BetterChat?.Call("API_IsUserInGroup", player.UserIDString, "neutral"))) BetterChat?.Call("API_RemoveUserFromGroup", player.UserIDString, "neutral");
                if(Convert.ToBoolean(BetterChat?.Call("API_IsUserInGroup", player.UserIDString, "hero")) || playerData.Rank == 1) return "hero";
                BetterChat?.Call("API_AddUserToGroup", player.UserIDString, "hero");             
                humanityData.playerH[player.userID].Rank = 1;
                SendReply(player, lang.GetMessage("NowA", this), "hero");     
            }else{
                if(Convert.ToBoolean(BetterChat?.Call("API_IsUserInGroup", player.UserIDString, "bandit"))) BetterChat?.Call("API_RemoveUserFromGroup", player.UserIDString, "bandit");
                if(Convert.ToBoolean(BetterChat?.Call("API_IsUserInGroup", player.UserIDString, "hero"))) BetterChat?.Call("API_RemoveUserFromGroup", player.UserIDString, "hero");
                if(Convert.ToBoolean(BetterChat?.Call("API_IsUserInGroup", player.UserIDString, "neutral")) || playerData.Rank == 0) return "neutral";
                BetterChat?.Call("API_AddUserToGroup", player.UserIDString, "neutral");             
                humanityData.playerH[player.userID].Rank = 0;
                SendReply(player, lang.GetMessage("NowA", this), "neutral");     
            }​

Please help me :)