SVM培训出错（样本类型的断言失败）

I am trying to use SVM to match a query image with its appropriate class. Right now the classes are just 1 or 0. I extract the class from a .txt file and store it into a Mat. I use BoW to compute a histogram for each image in the training set, and also store it into a Mat. I am trying to use SVM to match a query image w