TFS Server Side handler error

I'm following a tutorial on how to make a server side handler but when I check-in a item i get the following error:

Exception while attempting to inspect or instantiate type Microsoft.TeamFoundation.Framework.Server.WindowsProvider in assembly C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\tfs\96d93be0\609f57b6\assembly\dl3\71c3ceb4\00f38a60_8f06cb01\Microsoft.TeamFoundation.Framework.Server.DLL: No parameterless constructor defined for this object.

and

Exception while attempting to inspect or instantiate type Microsoft.TeamFoundation.Framework.Server.TfsSyncAgent in assembly C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\tfs\96d93be0\609f57b6\assembly\dl3\71c3ceb4\00f38a60_8f06cb01\Microsoft.TeamFoundation.Framework.Server.DLL: No parameterless constructor defined for this object.

Both are very similar

There are two main points to this:

1)Exception while attempting to inspect or instantiate type Microsoft.TeamFoundation.Framework.Server.WindowsProvider

2)Microsoft.TeamFoundation.Framework.Server.DLL: No parameterless constructor defined for this obj

I have posted this on stackoverflow and asp.net forums. It's not letting me post links here