OpenCV/WishList/IO/WriteMatrix

OpenCV Error: Parsing error (test.mat(0): Valid XML should start with '<?xml ...?>') in icvXMLParse, file /home/doriad/src/OpenCV/modules/core/src/persistence.cpp, line 2136 terminate called after throwing an instance of 'cv::Exception'

 what():  /home/doriad/src/OpenCV/modules/core/src/persistence.cpp:2136: error: (-212) test.mat(0): Valid XML should start with '<?xml ...?>' in function icvXMLParse

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CMakeLists.txt

cmake_minimum_required(VERSION 2.6)
 
PROJECT(WriteMatrix)
 
FIND_PACKAGE(OpenCV REQUIRED )
INCLUDE_DIRECTORIES( ${OPENCV_INCLUDE_DIR} )
 
 
ADD_EXECUTABLE(WriteMatrix WriteMatrix.cxx)
TARGET_LINK_LIBRARIES(WriteMatrix ${OpenCV_LIBS})