[c#] Parser Error: '_Default' is not allowed here because it does not extend class 'System.Web.UI.Page' & MasterType declaration

For me I had all of the namespaces on the pages and none of the solutions above fixed it. My problem was in:

<%@ Page Language="C#" 
AutoEventWireup="true" 
CodeBehind="xxx.aspx.cs" 
Inherits="xxx.xxx.xxx" 
MasterPageFile="~masterurl/default.master" %>

Then in my aspx.cs file the namespace did not match the Inherits tag. So it needed

namespace xxx.xxx.xxx

In the .cs to match the Inherits.

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