如题，报错文件是OpenGL--------------------------------
OpenGL: NVIDIA Corporation 3.3.0 GeForce 9600 GT/PCIe/SSE2/3DNOW!

Software
--------------------------------
OS: Microsoft Windows NT 5.1.2600 Service Pack 3 x86
.NET Version: 4.0.30319.1022
MCSkin3D Version: 1.6.0.600

Exception
--------------------------------
System.InvalidOperationException
Operation is not valid due to the current state of the object.
MCSkin3D.Editor :: System.String get_RootFolderString()
  - C:\Users\Paril\Documents\GitHub\mcskin3d\Forms\Editor.cs 209:5
MCSkin3D.Skin :: System.IO.DirectoryInfo get_Directory()
  - C:\Users\Paril\Documents\GitHub\mcskin3d\Skin.cs 88:5
MCSkin3D.Skin :: System.IO.FileInfo get_File()
  - C:\Users\Paril\Documents\GitHub\mcskin3d\Skin.cs 97:10
MCSkin3D.Skin :: Void CommitChanges(Paril.OpenGL.Texture, Boolean)
  - C:\Users\Paril\Documents\GitHub\mcskin3d\Skin.cs 255:6
MCSkin3D.Editor :: Void PerformSaveSkin(MCSkin3D.Skin)
  - C:\Users\Paril\Documents\GitHub\mcskin3d\Forms\Editor.cs 3866:4
MCSkin3D.Editor :: Void PerformSave()
  - C:\Users\Paril\Documents\GitHub\mcskin3d\Forms\Editor.cs 3917:4
MCSkin3D.Editor :: Void saveToolStripButton_Click(System.Object, System.EventArgs)
  - C:\Users\Paril\Documents\GitHub\mcskin3d\Forms\Editor.cs 2127:4
System.Windows.Forms.ToolStripItem :: Void RaiseEvent(System.Object, System.EventArgs)
System.Windows.Forms.ToolStripButton :: Void OnClick(System.EventArgs)
System.Windows.Forms.ToolStripItem :: Void HandleClick(System.EventArgs)
System.Windows.Forms.ToolStripItem :: Void HandleMouseUp(System.Windows.Forms.MouseEventArgs)
System.Windows.Forms.ToolStripItem :: Void FireEventInteractive(System.EventArgs, System.Windows.Forms.ToolStripItemEventType)
System.Windows.Forms.ToolStripItem :: Void FireEvent(System.EventArgs, System.Windows.Forms.ToolStripItemEventType)
System.Windows.Forms.ToolStrip :: Void OnMouseUp(System.Windows.Forms.MouseEventArgs)
System.Windows.Forms.Control :: Void WmMouseUp(System.Windows.Forms.Message ByRef, System.Windows.Forms.MouseButtons, Int32)
System.Windows.Forms.Control :: Void WndProc(System.Windows.Forms.Message ByRef)
System.Windows.Forms.ScrollableControl :: Void WndProc(System.Windows.Forms.Message ByRef)
System.Windows.Forms.ToolStrip :: Void WndProc(System.Windows.Forms.Message ByRef)
System.Windows.Forms.Control+ControlNativeWindow :: Void OnMessage(System.Windows.Forms.Message ByRef)
System.Windows.Forms.Control+ControlNativeWindow :: Void WndProc(System.Windows.Forms.Message ByRef)
System.Windows.Forms.NativeWindow :: IntPtr Callback(IntPtr, Int32, IntPtr, IntPtr)