XAML XML DataBinding does not work

I have a XML file like the fallowing:

<?xml version="1.0" encoding="utf-8" ?>
<Course
    Title="jQueryAjax"
    BtnAddisionalResourcesTitle=""
    BtnAddisionalResourcesAddress="">
<Topic
    Tag="ff"
    Title="">

    <Lesson
      Tag=""
      Title=""
      Address=""
    />

    <!--...-->


  </Topic>

  <!--...-->
</Course>

And also have a label like the fallowing

    <Label 
                HorizontalAlignment="Right"
                VerticalAlignment="Top"
                FontSize="16pt"
                FontFamily="Myriad Pro"
                >
            <Label.Content>
                <Binding Source="{StaticResource CourseInfo}"
                         XPath="Title"
                         UpdateSourceTrigger="PropertyChanged"
                         />
            </Label.Content>
        </Label>

And a XmlDataProvider in between:

<Window.Resources>
    <XmlDataProvider x:Key="CourseInfo" Source="Settings\CourseScema.xml"/>
</Window.Resources>

but get this error as I listen using System.Diagnostics.TextWriterTraceListener:

System.Windows.Data Information: 41 : BindingExpression path error: '' property not `found for 'current item of collection' because data item is null.  This could happen because the data provider has not produced any data yet. BindingExpression:Path=/; DataItem=null; target element is 'Label' (Name=''); target property is 'Content' (type 'Object')`

Any suggestions?