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Basic FileStorage operation problem - failed to open:

I have been struggling for a while by the failure to open file using FileStorage: It is part of the code from: \opencv\sources\samples\cpp\tutorial_code\calib3d\camera_calibration\camera_calibration.cpp:

FileStorage fs(inputSettingsFile, FileStorage::READ); // Read the settings
if (!fs.isOpened())
{
    cout << "Could not open the configuration file: \"" << inputSettingsFile << "\"" << endl;
    return -1;
}

It always failed. Tried absolute path also, still fails. Environment: Opencv version: 2.4.8, windows 7 (32-bit) and Visual Studio 2010. (Actually, tried 2.4.2 and VS2008, same problem) Anything I am missing?

Basic FileStorage operation problem - failed to open:

FileStorage fs(inputSettingsFile, FileStorage::READ); // Read the settings
if (!fs.isOpened())
{
    cout << "Could not open the configuration file: \"" << inputSettingsFile << "\"" << endl;
    return -1;
}