Try the purge-all command before deleting the unused layers.


>
> Message: 6
> From: "Haigh, Richard Daniel" 
> To: "'[email protected]'" 
> Date: Fri, 14 Dec 2001 17:20:05 -0000
> Subject: [mems-talk] mask design in AutoCAD
> Reply-To: [email protected]
>
> Dear colleagues,
>
> I am currently designing a mask set in AutoCAD R14, and have encountered
> some difficulties. There are a number of redundant layers that I now need to
> delete. However, when I attempt to delete these redundant layers the
> following message is displayed in AutoCAD:
>
> "The following layers cannot be deleted:
> {1} Layer 0 and Defpoint layers.
> {2} The current layer.
> {3} X-ref dependent layers
> {4} Layers containing objects."
>
> This message does not solve the problem, as:
> {1} The layers that I need to delete are separate from the defpoint or 0
> layers, (statement {1} may be discounted.)
> {2} The redundant layers cannot be deleted whether or not they are selected
> as current, (statement {2} may be discounted.)
> {3} There are no x-refs in the anywhere in the file [active or redundant
> layer], (statement {3} may be discounted)
> {4} There are no objects present in the redundant layers, (statement {4} may
> be discounted.)
>
>  I am at a loss as to understand the nature of this problem. I am writing to
> see if there is anyone in our research community with experience of AutoCAD
> who might recognise this problem and can perhaps offer a solution?
>
> Many Thanks
>
> Richard Haigh