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Error Sharepoint 2010 "Could not load type" when loading a custom Page

I replaced an existing SharePoint page through its own and then wanted to reference in the Page declaration on my class. After the deployment I got above error. This does not occur when you refer to the page declaration in the Inherit attribute not only to the class, but to the Assembly, the token and version.

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I had replaced an existing SharePoint page with a custom one and referenced in the page declaration to my class. After deployment I got the error mentioned above. This error will not raise, when you extend the inherit attribute with the assembly, token and version.

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New:

<%@ Page Language="C#" Inherits="[mein Namespace].[meine Klasse]" MasterPageFile="~/_layouts/dialog.master" %>