Layer filter messages

[BeKirra]

I recieved a drawing and every time I open it a message showed in the command line:

Opening an AutoCAD 2013 format file.
Regenerating model.

AutoCAD menu utilities loaded.._-layer
Current layer:  "0"
Enter an option [?/Make/Set/New/Rename/ON/OFF/Color/Ltype/LWeight/TRansparency/MATerial/Plot/Freeze/Thaw/LOck/Unlock/stAte/Description/rEconcile]: filter
Current layer filter: "All"

Enter a layer filter option [New/Set/Rename/Edit/Delete/eXit]: set
Enter layer filter to make current: Mech_1
Layer filter not found.
Enter layer filter to make current:
Layer filter not found.
Enter layer filter to make current:
Enter layer filter to make current:
Command:

Autodesk DWG.  This file is a TrustedDWG last saved by an Autodesk application or Autodesk licensed application.

Command:
Layer filter not found.
Enter layer filter to make current:

There is no layer filter in the layer manager.

The current layer state is "_LAYISO_STATE" in model space and "Same as DWG" = "No".

I know that the layer filter "Mech_1" has been removed and most likely some of layers were delected with the filter.

How to prevent the message pops up again when opening the drawing?

Thanks for your help.

[pendean]

Looks like you are running a custom startup: yours?
Or by chance is there an acad.lsp file that suddenly showed up in the same folder as this file?