ASP.NET - Fixing Parser Error: Could not load type '_Default'

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It is easy to to fix the parser error: Could not load type '_Default'"

It happens because your application is sitting on virtual directory but it is not configured as application. Right click on your virtual directory in your IIS and then click "Convert to Application".

In case, if you are using any web hosting provider like GoDaddy.com, then click here for resolution.