OpenCV声明失败错误

我正在研究一个需要脸部识别和预测的项目。 当我上传一个图像时，它应该从数据库中识别出这个人。我试图用Nodejs和OpenCV来实现。 我的代码如下所示：

var FaceRecognizer = new cv.FaceRecognizer(); var uploadDir = joinPath(__dirname, "/images"); var fileDir = joinPath(__dirname, "/uploads"); var cvImages = []; fs.readdir(uploadDir, function(err, files){ if(err){ throw new Error(err); } if(files.length > 0){ //There are some user related image folders files.forEach(function(subfolder, index, array){ if(subfolder != ".DS_Store" ){ //Issue with Mac, test on Linux-VM //We are now iterating over each subfolder var subFolderDir = joinPath(uploadDir, "/"+"subfolder"); var images = fs.readdirSync(subFolderDir); images.forEach(function(image, index, array){//Get Matrix Objekt for each image to train OpenCV if(image != ".DS_Store"){ var imageDir = joinPath(subFolderDir, "/"+image); cv.readImage(imageDir, function(err, im){ var channels = im.channels(); if(channels >=3){ var labelNumber = parseInt(Math.floor((Math.random()* 10)+1)); //Create labelnumber; Account-Id starts by 1, labels for openCV start with 0 cvImages.push(new Array(labelNumber,im)); //Add image to Array } }); } }); } }); if(cvImages.length > 3){ console.log("Training images (we have at least 3 images)", cvImages); FaceRecognizer.trainSync(cvImages); cv.readImage(fileDir, function(err, im){ if(err) res.send(err); var whoisit = FaceRecognizer.predictSync(im); console.log("Identified image", whoisit); }) }else{ console.log("Not enough images uploaded yet", cvImages); } }else{ console.log("There are no images uploaded yet!"); } }); 

我得到这个错误：

 OpenCV Error: Assertion failed (s >= 0) in setSize, file /build/opencv-SviWsf/opencv-2.4.9.1+dfsg/modules/core/src/matrix.cpp, line 116 terminate called after throwing an instance of 'cv::Exception' what(): /build/opencv-SviWsf/opencv-2.4.9.1+dfsg/modules/core/src/matrix.cpp:116: error: (-215) s >= 0 in function setSize Aborted (core dumped) 

任何人都可以提出任何可能的解