use KMeansIndexParams clustering descriptors and question

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Configuration: Opencv2.4.10+Ubuntu14.04+QT5.8

I want to use cv::flann::KmeansIndexParams to cluster the descriptors.The storage of all descriptors is all_descriptors,as follow:

all_descriptors=cv::Mat(total_descriptors_count,descriptor_length,CV_32FC1);

When I used KMeansIndexParams clustering it,the code just stopped there,I think there must be something wrong,but I can't find the solution.

line108:tree=new cv::flann::Index(all_descriptors,cv::flann::KMeansIndexParams(32,11,cvflann::FLANN_CENTERS_KMEANSPP，0.2)；