NullReferenceException: Object reference not set to an instance of an object.
  File "C:\Users\matth\Desktop\dwarfcorp\DwarfCorp\DwarfCorpXNA\Voxels\VoxelListPrimitive.cs", line 400, in BuildVoxelFaceGeometry
    Void BuildVoxelFaceGeometry(DwarfCorp.RawPrimitive, DwarfCorp.VoxelChunk, Cache, DwarfCorp.BoxPrimitive, DwarfCorp.VoxelHandle, Microsoft.Xna.Framework.Color, BoxTextureCoords, Microsoft.Xna.Framework.Matrix, Int32, Boolean)
  File "C:\Users\matth\Desktop\dwarfcorp\DwarfCorp\DwarfCorpXNA\Voxels\VoxelListPrimitive.cs", line 302, in BuildVoxelGeometry
    Void BuildVoxelGeometry(DwarfCorp.RawPrimitive, Int32, Int32, Int32, DwarfCorp.VoxelChunk, DwarfCorp.BoxPrimitive, Cache, DwarfCorp.DesignationSet, DwarfCorp.DesignationDrawer, DwarfCorp.WorldManager)
  File "C:\Users\matth\Desktop\dwarfcorp\DwarfCorp\DwarfCorpXNA\Voxels\VoxelListPrimitive.cs", line 236, in BuildSliceGeometry
    Void BuildSliceGeometry(DwarfCorp.VoxelChunk, DwarfCorp.BoxPrimitive, Cache, Int32, DwarfCorp.RawPrimitive, DwarfCorp.DesignationSet, DwarfCorp.DesignationDrawer, DwarfCorp.WorldManager)
  File "C:\Users\matth\Desktop\dwarfcorp\DwarfCorp\DwarfCorpXNA\Voxels\VoxelListPrimitive.cs", line 205, in InitializeFromChunk
    Void InitializeFromChunk(DwarfCorp.VoxelChunk, DwarfCorp.DesignationSet, DwarfCorp.DesignationDrawer, DwarfCorp.WorldManager)
  File "C:\Users\matth\Desktop\dwarfcorp\DwarfCorp\DwarfCorpXNA\Voxels\VoxelChunk.cs", line 164, in Rebuild
    Void Rebuild(Microsoft.Xna.Framework.Graphics.GraphicsDevice)
...
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Object reference not set to an instance of an object.