Couldn't link opencv with qt creator , this error happens

[Zlatomir]

My bad, sorry, some copy/paste errors, i corrected the error in my previous post, and also you seem to have the 2.49 version of opencv (you can check the file names in that lib folder), so the code becomes:

CONFIG( debug, debug|release ) {
    #debug libs
    LIBS +=-LC:/opencv/build/x86/vc11/staticlib\
    -lopencv_core249d\
    -lopencv_highgui249d
    }
    else {
    #release libs
    LIBS +=-LC:/opencv/build/x86/vc11/staticlib\
    -lopencv_core249\
    -lopencv_highgui249
    }

CONFIG( debug, debug|release ) {
    #debug libs
    LIBS +=-LC:/opencv/build/x86/vc11/staticlib\
    -lopencv_core249d\
    -lopencv_highgui249d
    }
    else {
    #release libs
    LIBS +=-LC:/opencv/build/x86/vc11/staticlib\
    -lopencv_core249\
    -lopencv_highgui249
    }

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LE: don't forget to run qmake after you modify the .pro file.