Here are a few comments I found online while searching for the cause of the error you're seeing:
* "This exception is often caused by an error in the security configuration on the computer that is running the Visual Studio Tools for Office solution."
* "After spending a whole day investigating this, here is the answer to my problem... a custom rule by my company's virus software is blocking the .net framework ability (or excel's rather) to create the 'shadow copy' version of the vsto
.dll. This completely renders any case of VSTO useless in my entire corporation..."
So my first question is this: Are you attempting to run this at work? If so, ask your IT department if they've applied a security policy that would prevent Microsoft's .NET Framework from shadow-copying DLLs, which is what has to happen in order for
NodeXL to run.