FlannMatcher with HierarchicalClusteringIndexParams and binary descriptors

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Hi. I'm trying to use FlannMatcher with HierarchicalClusteringIndexParams and binary descriptors. Opencv version is 3.0.0(dev). It throws the following error:

OpenCV Error: Unsupported format or combination of formats (type=0 ) in cv::flann::buildIndex_, file D:\dev\opencv\source\modules\flann\src\minifla nn.cpp, line 315

It works fine with LshIndexParams.

Am I missing something?

EDIT: Solved. You have to convert descriptors to float(CV_32F) before adding them to the matcher. Query descriptors also have to be converted to float.