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PONullReferenceException when creating instance of Game class (OpenTKGameWindow.Initialize)
 

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  1. PONullReferenceException when creating instance of Game class (OpenTKGameWindow.Initialize)
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    <p>I just installed xamarin and monogame on OSX I have tried to run a really basic demo project that works perfectly on windows. But I get the following error:</p> <p><img src="https://i.stack.imgur.com/D69P9.png" alt="enter image description here"></p> <pre><code>System.NullReferenceException: Object reference not set to an instance of an object at Microsoft.Xna.Framework.OpenTKGameWindow.Initialize () [0x00000] in &lt;filename unknown&gt;:0 at Microsoft.Xna.Framework.OpenTKGameWindow..ctor () [0x00000] in &lt;filename unknown&gt;:0 at Microsoft.Xna.Framework.OpenTKGamePlatform..ctor (Microsoft.Xna.Framework.Game game) [0x00000] in &lt;filename unknown&gt;:0 at Microsoft.Xna.Framework.GamePlatform.Create (Microsoft.Xna.Framework.Game game) [0x00000] in &lt;filename unknown&gt;:0 at Microsoft.Xna.Framework.Game..ctor () [0x00000] in &lt;filename unknown&gt;:0 at test.Game1..ctor () [0x00057] in /Users/remojansen/Desktop/test/test/Game1.cs:37 at test.Program.Main () [0x00001] in /Users/remojansen/Desktop/test/test/Program.cs:19 </code></pre> <p>There is nothing wrong about the code so I must be missing a DLL or something? Do you have any ideas about what could be missing?</p> <p>Thanks :)</p> <p><strong>[EDIT]</strong></p> <p>The disassembly shows a error in the second line:</p> <pre><code>00000155 callvirt IWindowInfo OpenTK.NativeWindow:get_WindowInfo () 0000015a ldnull 0000015b callvirt Object System.Reflection.PropertyInfo:GetValue (Object, Object[]) 00000160 unbox.any System.IntPtr 00000165 stfld 0000016a call GraphicsMode OpenTK.Graphics.GraphicsMode:get_Default () 0000016f ldarg.0 00000170 ldfld 00000175 callvirt IWindowInfo OpenTK.NativeWindow:get_WindowInfo () 0000017a newobj Void OpenTK.Graphics.GraphicsContext:.ctor (GraphicsMode, IWindowInfo) </code></pre> <p>I have also manually compiled OpenTK and when I run the examples they seem to work fine:</p> <p><img src="https://i.stack.imgur.com/3DlTI.png" alt="enter image description here"></p> <p>I guess the problem is in monogame, I installed monogame using the xamarin monogame project template.</p>
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    1. USRemo H. Jansen
    1. USRemo H. Jansen
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    1. COThis is a wild guess but I'd say you are missing the XNA framework running under mono. Especially since the stack show all of the tasks for XNA occuring in filename unknown. Go do some Googling and make sure XNA will run under mono.
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      1. PONullReferenceException when creating instance of Game class (OpenTKGameWindow.Initialize)
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    2. COXNA does not run under mono. That's why they created MonoGame (the open source port of XNA). Anyway, I don't know much about building on OSX either but it looks like you need to install OpenTK or Mono, perhaps this: http://www.go-mono.com/mono-downloads/download.html
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      1. UScraftworkgames
 

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