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Asked: 2026-06-07T00:53:04+00:00

I am getting the common ASP.NET YSOD error. Here is the full error page

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I am getting the common ASP.NET YSOD error. Here is the full error page as requested: 

Server Error in '/' Application.
--------------------------------------------------------------------------------

Parser Error 
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. 

Parser Error Message: Could not load type 'WebApplication1.WebForm1'.

Source Error: 

Line 1:  <%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="WebApplication1.WebForm1" %>
Line 2:  
Line 3:  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

Source File: /WebForm1.aspx    Line: 1 

--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272

But only on my local machine. I tried the option to Use Local IIS Web Server and this gives the same error.

Everything I have read says ‘just re-compile’ I have done this but it makes no difference.

I am using VS2010.

Does anyone know what the cause of this is?

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1 Answer

  1. Editorial Team

    Check the DamoDBear’s Answer on this SO Thread – Parser Error Message: Could not load type 'TestMvcApplication.MvcApplication' .

    There might be two reason, may be that will help in future who will face an issue.

    a)The file in which we have changed it was not updated properly, so that's why It
  was causing an error,so project .dll has updated but that page was not updated 
  properly.

b)That page Excluded from the project.

    so Please keep these thing in your mind. Most of the cases files was not updated.

    Related MSDN Link : Bin folder location causes "Parser Error Message: Could not load type" problem

    Hope this help.

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