VS 2015 is giving [No relevant source lines]

Using VS 2015
On Win 2012 R2 Server

I used to run my solution ok.  Now I am getting:

      On browser - [No relevant source lines]  

      In error list - Error      BC30456      'Context' is not a member of '_Default'.      SalJasOld      C:\SalJasOld\Default.aspx      1      Active

The code Is

    <%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

Any one can help?
saljasAsked:
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saljasAuthor Commented:
If I edit the Default.aspx.vb and insert a code (for any of the controls in the form) then the error disappears!!!!
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saljasAuthor Commented:
I think once the inherit line is included then the file must have a code, It must not have zero length.
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