I created the website in Visual Studio, using ASP.NET technology, while i test the website using any browser in Visual Studio, it works very fine, 
However, when i try to run it from the folder, I get a message.
{ This page contains the following errors: <div>error on line 1 at column 2: StartTag: invalid element name</div> Below is a rendering of the page up to the first error. }
Please can anyone help to solve this in a bit simple way. 

THANKS IN ADVANCE. :)

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