QBRTCSession is always nill
<p>I am using Quickblox in my app for video calling,I registered and logged in successfully but when ever i try to create a  QBRTCSession with following line,i always get a nill,please help me.</p>

<pre><code>QBRTCSession* videoSession = [QBRTCClient.instance createNewSessionWithOpponents:opponentsIDs withConferenceType:QBRTCConferenceTypeVideo];
</code></pre>

<p>Below is my total code:</p>

<pre><code>    [QBRequest logInWithUserEmail:[userDefaults valueForKey:@"loginEmail"] password:[userDefaults valueForKey:@"loginPassword"] successBlock:^(QBResponse * _Nonnull response, QBUUser * _Nullable user) {

    NSError* error;
    QBUUser* theUser = [QBUUser user];
    theUser.ID = 00000;
    [QBChat.instance connectWithUser:theUser completion:^(NSError * _Nullable error) {
    }];

    [userDefaults setInteger:user.ID forKey:@"userId"];
    [userDefaults synchronize];
    [QBRTCClient initializeRTC];

    [QBRTCConfig setAnswerTimeInterval:60];
    [QBRTCConfig setDialingTimeInterval:10];
    [QBRTCConfig setDisconnectTimeInterval:30];//        [QBRTCConfig setDTLSEnabled:false];

    [[QBRTCMediaStreamConfiguration alloc] init];
    configurations.audioCodec = QBRTCAudioCodeciLBC;
    configurations.videoCodec = QBRTCVideoCodecH264;
    [QBRTCConfig setICEServers:[self quickbloxICE]];
    [QBRTCConfig setMediaStreamConfiguration:configurations];
    [QBRTCConfig setStatsReportTimeInterval:1.f];

    [QBRTCClient.instance addDelegate:self];
    NSArray* opponentsIDs = @[@000000];
    [QBSettings setAutoReconnectEnabled:YES];

    QBRTCSession* videoSession = [QBRTCClient.instance createNewSessionWithOpponents:opponentsIDs withConferenceType:QBRTCConferenceTypeVideo];

    CallViewController *callViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"CallViewController"];
    callViewController.session = videoSession;
    callViewController.initiator = user;
 [self presentViewController:callViewController animated:NO completion:nil];
} errorBlock:^(QBResponse * _Nonnull response) {

    NSLog(@"%@",[response.error description]);
}];

- (NSArray *)quickbloxICE {

NSString *password = @"baccb97ba2d92d71e26eb9886da5f1e0";
NSString *userName = @"quickblox";

QBRTCICEServer *server = [QBRTCICEServer serverWithURL:@"https://myserver:port" username:@"" password:@""];

QBRTCICEServer * stunServer = [QBRTCICEServer serverWithURL:@"stun:turn.quickblox.com"
                                                   username:@""
                                                   password:@""];

QBRTCICEServer * turnUDPServer = [QBRTCICEServer serverWithURL:@"turn:turn.quickblox.com:3478?transport=udp"
                                                      username:userName
                                                      password:password];

QBRTCICEServer * turnTCPServer = [QBRTCICEServer serverWithURL:@"turn:turn.quickblox.com:3478?transport=tcp"
                                                      username:userName
                                                      password:password];


return@[server,stunServer, turnTCPServer, turnUDPServer];}
</code></pre>