Use resources in Class Library from WebForms app

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C#

ASP.NET4

hello
In my application there is one class library project and one website.
I create a resource file in class library and modifier of it is public.

I need to use this resource in website layer but i giv error.

<asp:Label ID="Label2" runat="server" Text="<%$ Resources:resourceName, ErrorEmptyName %>"></asp:Label>

error:

The resource object with key 'ErrorEmptyName ' was not found.	

but in code page i access this key:
Label1.Text = resourceName.ErrorEmptyName;
and no error.

my resource file for me is a file with resx extention.

What is wrong?how do it?

Thank you in advance.