VS2013 -- External component has thrown an exception

Just started working with Visual Studio 2013 Express web.  I create a responsive web site the other day.  Each day I have been trying to learn more about making changes to the layout.  Tonight, I added one addition menu item to the default menu items.

                        <li><a runat="server" href="~/">Home</a></li>
                        <li><a runat="server" href="~/About">About</a></li>
                        <li><a runat="server" href="~/Daily_Living">Daily Living</a></li>
                        <li><a runat="server" href="~/Contact">Contact</a></li>

The next time I ran it (Debug --> Start Debugging), I get 2 errors.  Both errors are the same: "External Component has thrown an exception."  Sheesh!?  Just because I added a menu item?  I took the menu item out, but I still get the two errors.
rrhandle8Asked:
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käµfm³d 👽Commented:
Basically, you have an issue with the code portions--i.e. the Razor, not the HTML--of your views. You need to track down what it is. It's most likely a syntax error. If you care to post the whole view, then we can probably help you track it down.
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rrhandle8Author Commented:
I am using ASP Forms not MVC
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rrhandle8Author Commented:
Well, shutting VS2013 down and restarting it got rid of the error. Go figure.  Any explanations for this behavior?  I would like to understand what just happened.
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rrhandle8Author Commented:
Just a simple restart fixed the problem.
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