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POInvalidOperationsException during XML-Serialization in XNA
 

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    <p>I have a question concerning an Error I experience while trying to read an XML-File through the XNA 4.0 Content Pipeline in order to build Objects. First I reused old XNA 3.1 Code of mine which worked back in the day but now throws the an Error Message:</p> <p>Building content threw InvalidOperationException: Instanzen von abstrakten Klassen können nicht erstellt werden. (Unable to build Instances of abstract Classes - roughly translated) at ReflectionEmitUtils() ...and goes on forever, I can post it, if it's needed, but for better readability of my initial request..</p> <p>Then I used this <a href="http://msdn.microsoft.com/en-us/library/ff604979" rel="nofollow">Method</a> but it throws the same error.</p> <p>These are the relevant pieces of source code: I've written a class to define the content/structure of the XML-File:</p> <pre><code>public class Command { public List&lt;bool&gt; mButtons; public List&lt;Keys&gt; keys; public Enum iD; } </code></pre> <p>And this is my XML File, with which I want to build Command-Objects</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt; &lt;XnaContent&gt; &lt;Asset Type="KinectRTS_Input.Command"&gt; &lt;mButtons&gt;true/mButtons&gt; &lt;keys&gt; &lt;Item&gt;LeftControl/Item&gt; &lt;/keys&gt; &lt;iD&gt;SMulti/iD&gt; &lt;/Asset&gt; &lt;/XnaContent&gt; </code></pre> <p>(In my code, the Brackets are all correct, though since this Form processes XML-Tags...;)) I used a <a href="http://blogs.msdn.com/b/shawnhar/archive/2008/08/12/teaching-a-man-to-fish.aspx" rel="nofollow">Test-Application</a> in order to find out, which Format the XNA-Serializer uses to output List-Items and enums, so I'm reasonably sure, that there's not the error.</p>
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