Cant Read the lumps...

[Rcj8993]

im making a few maps, and well, this morning I open my Wad,
the E1M2's name was changed to something else.
and well... I changed the name back and now I cant open the level

Object reference not set to an instance of an object.
at CodeImp.DoomBuilder.Windows.MainForm.RemoveDocker(Docker d)
at CodeImp.DoomBuilder.BuilderModes.BuilderPlug.OnMapCloseEnd()
at CodeImp.DoomBuilder.Plugins.PluginManager.OnMapCloseEnd()
at CodeImp.DoomBuilder.MapManager.Dispose()
at CodeImp.DoomBuilder.General.OpenMapFileWithOptions(String filename, MapOptions options)
at CodeImp.DoomBuilder.General.OpenMapFile(String filename, MapOptions options)
at CodeImp.DoomBuilder.General.OpenMap()
at CodeImp.DoomBuilder.Actions.Action.Begin()
at CodeImp.DoomBuilder.Actions.ActionManager.InvokeAction(String actionname)
at CodeImp.DoomBuilder.Windows.MainForm.InvokeTaggedAction(Object sender, EventArgs e)
at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
at System.Windows.Forms.ToolStripButton.OnClick(EventArgs e)
at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met)
at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met)
at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ToolStrip.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

is it possible GZ doom builder caused this?
I get a lot of errors when I run it...

[Vincent(PDP)]

What application did you change the name with?

You can try changing it back to the other name.

[Rcj8993]

Gzdoombuilder. Somehow it changed a sound file to be e1m2.... that's exactly what happened. I just imported from a copy I had of the map using doom builder and it put the map back in.... also I couldn't change the name back as it wouldn't open e1m2 because of errors...