Andy, when you post a question like this, it's helpful to provide a little bit more information. For instance, you're leaving us to guess where SerializationEngine comes from, so while I assume you're talking about SharpGL I can't be certain this is the case. As a hint, when you're running the application inside Visual Studio, you can get the stack trace where the exception occurs. When you get the exception dialog, choose to copy the details of the exception as this lists the full stack and gives you more of an idea where the problem is. Also, if the code you're running against is SharpGL, you can download and build it yourself and step into the code while you're debugging.
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