Error parsing attribute 'page'

我在自己的电脑上可以正常运行，发布后，提示如下错误：
Error parsing attribute 'page': Cannot create an object of type 'System.Web.UI.Page' from its string representation '' for the 'Page' property.
并在Sorece Error中显示：
Line 1: <%@ master language="C#" autoeventwireup="true" inherits="YHMaster, App_Web_yqliiaml" Page EnableEventValidation="true" %>
这是什么原因呢？

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