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Stitcher module errors

I'm trying to use the OpenCV Stitcher Module on iOS to stitch two photos into one.

Here's my code:

- (UIImage *)stitchImages
    cv::Stitcher stitcher = cv::Stitcher::createDefault(TRUE);

    cv::Mat img1 = [openCVUtil cvMatWithImage:[UIImage imageNamed:@"1.jpg"]];
    cv::Mat img2 = [openCVUtil cvMatWithImage:[UIImage imageNamed:@"2.jpg"]];

    cv::vector<cv::Mat> images;

    cv::Mat imgOut;
    cv::Stitcher::Status status = stitcher.composePanorama(images, imgOut);
    if(status == cv::Stitcher::Status::OK) {
        UIImage *outImg = [openCVUtil imageWithCVMat:imgOut];
        return outImg;
    return nil;

At the end I'm getting this error:

OpenCV Error: Assertion failed (imgs.size() == imgs_.size()) in composePanorama

Can you please explain what am I doing wrong?