Can't push another viewcontroller when passing data from unity3d to iOS

Question

I have a bridge between unity 3d and iOS to pass data. I can sent data successfully from unity 3d to my iOS using extern "C", then i can call a objective c method from a method of extern "c". But from the objective c method, if i want to push another viewcontroller then it crashes and show the following issue.

A view can only be associated with at most one view controller at a time! View is associated with Clear this association before associating this view with...

How can i solve this issue ?

Here is my View Controller class :

@implementation ARViewController


- (void)viewDidLoad
{
    [super viewDidLoad];

    // Just setting Unity delegates and view to add it as subview for my main view.
    // This allow me to add a UIButton above the UnityView to popViewController or anything i want to make native in iOS.

    unityViewController         = [[UnityDefaultViewController alloc] init];
    unityController             = (UnityAppController*)[[UIApplication sharedApplication] delegate];
    unityViewController.view    = (UIView*)unityController.unityView;

    [viewToUnity addSubview:unityViewController.view];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)gotoAnotherViewController
{

    ViewController *arVC = [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"ClickVC"];
    [self presentViewController:arVC animated:YES completion:nil];

    dispatch_async(dispatch_get_main_queue(), ^{

    });
}

@end

extern "C" {

    void _NativeMethodName(const char* stringValue)
    {
        [[ARViewController new] gotoAnotherViewController];
        NSLog(@"Passed string value: %s", stringValue);
    }

}