camera device:     Lenovo EasyCamera

os platform:     Win10

Unity version:    5.1.1f1 personal

And I add these codes to    Assests/Vuforia/Editor/WebCamProfiles/profile.xml

    <webcam deviceName="Lenovo EasyCamera">
        <windows>
            <!-- size of the web cam texture requested from Unity -->
            <requestedTextureWidth>640</requestedTextureWidth>
            <requestedTextureHeight>360</requestedTextureHeight>
            <!-- size of the texture Unity's web cam texture will be rescaled to -->
            <resampledTextureWidth>640</resampledTextureWidth>
        </windows>
        <osx>
            <!-- size of the web cam texture requested from Unity -->
            <requestedTextureWidth>1280</requestedTextureWidth>
            <requestedTextureHeight>720</requestedTextureHeight>
            <!-- size of the texture Unity's web cam texture will be rescaled to -->
            <resampledTextureWidth>640</resampledTextureWidth>
        </osx>
    </webcam>

but error still show.

Where is the error? And how  to fix this? Thanks! Could some one help me?