No matching constructor found on type

I'm making Windows Phone 7.1 app with Visual Studio Express 2012 for Windows Phone.

I added this namespace to MainPage.xaml:

xmlns:myNameSpace="clr-namespace:MyApp"

And this:

<Grid.Resources>
        <myNameSpace:MyClass x:Key="referenceToMyClass" />
</Grid.Resources>

And used like this in same file:

<ListBox Name="MyListBox"
         Height="{Binding ElementName=ContentPanel, Path=Height}"
         Width="{Binding ElementName=ContentPanel, Path=Width}"
         ItemsSource="{StaticResource referenceToMyClass}"
         DisplayMemberPath="MyAttribute" />

MyClass looks like this:

namespace MyApp
{
    class MyClass : ObservableCollection<AnotherClass>
    {
        public MyClass()
        {
            Class temp = new AnotherClass("Example attribute");
            Add(temp);
        }

        public void AddAnotherClass(AnotherClass anotherClass)
        {
            Add(anotherClass);
        }
    }
}

So when I try to Debug it on my cellphone I get the following error:

A first chance exception of type 'System.Windows.Markup.XamlParseException' occurred in System.Windows.dll Additional information: No matching constructor found on type 'MyApp.MyClass'.