Error hybridtrackingsample.cpp

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version 2.4.4.0 SO Mac OS 10.7.5 Developer in Xcode 4.6 cpp hybridtrackingsample.cpp

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Opened camera OpenCV Error: Bad argument (Unknown feature type) in CvFeatureTracker, file /opt/local/var/macports/build/_opt_mports_dports_graphics_opencv/opencv/work/OpenCV-2.4.4/modules/contrib/src/featuretracker.cpp, line 70 terminate called throwing an exceptionstrong text