Crash on startup

[Vershner]

The game crashes on startup if I tell it to use the Amiga files. (either prefer or force)

It's a bit random. It did run once with Amiga music and DOS sound, but then never again.
When it loads, it opens a plain white window, plays the first note of the music, then exits.

These are the errors I get:

D:\games\Freeserf.net>FreeserfNet.exe
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at Freeserf.MainWindow.MainWindow_Update(Double)
at Silk.NET.Windowing.Desktop.GlfwWindow.RaiseUpdateFrame()
at Silk.NET.Windowing.Desktop.GlfwWindow.DoUpdate()
at Silk.NET.Windowing.Common.WindowExtensions+<>c__DisplayClass2_0.b__0()
at Silk.NET.Windowing.Desktop.GlfwWindow.Run(System.Action)
at Silk.NET.Windowing.Common.WindowExtensions.Run(Silk.NET.Windowing.Common.IView)
at Silk.NET.Window.Window.Run()
at Freeserf.Program.Main(System.String[])

D:\games\Freeserf.net>FreeserfNet.exe
Fatal error. Internal CLR error. (0x80131506)
at Silk.NET.OpenGL.X6CDF1A2D.GL.Clear(UInt32)
at Freeserf.GameView.Render()
at Freeserf.MainWindow.MainWindow_Render(Double)
at Silk.NET.Windowing.Desktop.GlfwWindow.RaiseRenderFrame()
at Silk.NET.Windowing.Desktop.GlfwWindow.DoRender()
at Silk.NET.Windowing.Common.WindowExtensions+<>c__DisplayClass2_0.b__0()
at Silk.NET.Windowing.Desktop.GlfwWindow.Run(System.Action)
at Silk.NET.Windowing.Common.WindowExtensions.Run(Silk.NET.Windowing.Common.IView)
at Silk.NET.Window.Window.Run()
at Freeserf.Program.Main(System.String[])

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freeserf.log:
17:42:06 Info: [Data] Looking for game data in 'D:\games\Freeserf.net/music'...
17:42:06 Info: [Data] Looking for game data in 'D:\games\Freeserf.net/SPAE.PA'...
17:42:06 Info: [Data] Looking for game data in 'D:\games\Freeserf.net/sounds'...
17:42:06 Info: [Data] Looking for game data in 'D:\games\Freeserf.net/gfxheader'...
17:42:06 Info: [Data] Looking for game data in 'D:\games\Freeserf.net/gfxfast'...
17:42:06 Info: [Data] Looking for game data in 'D:\games\Freeserf.net/gfxchip'...
17:42:06 Info: [Data] Game data found in 'D:\games\Freeserf.net'...

Even when the game runs with the DOS file, the building graphics are missing. Is there a particular version that is needed?
I have SPAE.PA