I'm trying to delete the attributes in four rooms related to Feature_Container, now that they are not also containers, and do not have that feature checked. Every time I try to delete any of these attributes, which are marked fale, I am error warned that I have to do something else, first. What would that be? How can I delete the attributes referring to container?

System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
at TextAdventures.Quest.Fields.RemoveField(String name)
at TextAdventures.Quest.EditorData.RemoveAttribute(String attribute)
at TextAdventures.Quest.EditorControls.WFAttributesControl.cmdDelete_Click(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)

That looks like they don't have those attributes. Could be a glitch in the editor?
I'd try saving your progress, exit and reload the editor, and try again. If that fails, you could remove the attributes in code view.

I looked into the code view and noticed, even though they are rooms object/rooms, they all say feature_container for inheret . They do not say room anywhere in code view, only in tabs. Could I change inheret labels to room? I have an added attribute on each that has an integer that goes up by one when certain other rooms are entered, and I don't want that to be affected.