generic_descriptor_match

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Hello, i try to get the generic_desciptor_match.cpp file run with the FernDescriptorMatcher. I call it like this:

generic_descriptor_match.exe image.bmp ref_image.bmp FERN params.xml

The problem that i've got is, that it can't create the descriptor and i don't know why. The XML-file with the params looks like this:

• < ?xml version="1.0"?>
• < opencv_storage>
• < nclasses>50</nclasses>
• < patchSize>31</patchsize>
• < signatureSize>2147483647</signaturesize>
• < nstructs>50</nstructs>
• < structSize>9</structsize>
• < nviews>1000</nviews>
• < compressionMethod>0</compressionmethod>
• < /opencv_storage>*

The created descriptorMatcher is always null. Why doesn't it work?