ios环信集成调用ChatViewController崩溃

大家好，我刚集成完环信demo进公司的项目，证书也没上传，一句代码也没添加，调用ChatViewController直接崩溃。请问可能是什么原因   
这是调用的代码
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    ChatViewController *chat = [[ChatViewController alloc]initWithChatter:@"test2" isGroup:NO];
    [self presentViewController:chat animated:YES completion:nil];

}
 
报错原因是
[EMDeviceManager _setupNetworkMonitor]: unrecognized selector sent to instance 0x1036d720
 
 
是否需要先上传证书，并在appdelegate中加入代码？