请大神帮忙看下 这是神马问题

qqluzidong

LoaderThread
Microsoft.Xna.Framework.Graphics.OutOfVideoMemoryException: 外部组件发生异常。
   在 Microsoft.Xna.Framework.Graphics.DepthStencilBuffer..ctor(GraphicsDevice graphicsDevice, Int32 width, Int32 height, DepthFormat format, MultiSampleType multiSampleType, Int32 multiSampleQuality)
   在 PolygonHead.Lights.DirectionalLight.CreateShadowMap()
   在 PolygonHead.Lights.DirectionalLight.set_CastShadows(Boolean value)
   在 Magicka.Levels.LevelModel..ctor(ContentReader iInput)
   在 Magicka.ContentReaders.LevelModelReader.Read(ContentReader input, LevelModel existingInstance)
   在 Microsoft.Xna.Framework.Content.ContentReader.InvokeReader[T](ContentTypeReader reader, Object existingInstance)
   在 Microsoft.Xna.Framework.Content.ContentReader.ReadObjectInternal[T](Object existingInstance)
   在 Microsoft.Xna.Framework.Content.ContentReader.ReadObject[T]()
   在 Microsoft.Xna.Framework.Content.ContentReader.ReadAsset[T]()
   在 Microsoft.Xna.Framework.Content.ContentManager.ReadAsset[T](String assetName, Action`1 recordDisposableObject)
   在 Magicka.SharedContentManager.CommonContentManager.Load[T](String assetName)
   在 Magicka.SharedContentManager.Load[T](String assetName)
   在 Magicka.Levels.GameScene.Initialize(SpawnPoint iSpawnPoint, Boolean iClearAudio)
   在 Magicka.Levels.Level.ChangeScene()
   在 Magicka.Levels.Level.GoToScene(SpawnPoint iSpawnPoint, Transitions iTransition, Single iTransitionTime)
   在 Magicka.GameLogic.GameStates.PlayState.Initialize()
   在 Magicka.Game.LoaderFunction()