[mapserver-users] replacing layer with different scales.

[ElPer]

Hello

I need help with the mapfile of the mapserver and I hope you can help me.
I want to replace one layer with another at different scale, but I get
always an Error.
In the documentation I read that I can replace it with the same name
according to different scales: 
"The name should be unique, unless one layer replaces another at different
scales."
Our Mapserver uses also Tilecache and I'm not sure if the error comes from
the mapserver or tilecache.

Thanks for your help

Here is my mapfile:

MAP
   NAME Nautical Map
   STATUS ON
  
   # Spherical Mercator
   EXTENT -20037508.34 -20037508.34 20037508.34 20037508.34
   PROJECTION
      "init=epsg:900913"
   END

   SIZE 2048 2048

   IMAGETYPE mypng
   OUTPUTFORMAT
      NAME "mypng"
      DRIVER AGG/PNG
      MIMETYPE "image/png"
      IMAGEMODE RGBA
      EXTENSION "png"
      TRANSPARENT ON
      FORMATOPTION "INTERLACE=OFF"
   END

   WEB
      IMAGEPATH "/opt/fgs2/tmp/ms_tmp/"
      IMAGEURL "/ms_tmp/"
      METADATA
         "wms_srs" "EPSG:4326 EPSG:900913"
      END
   END

    LAYER
      NAME MIPARE_A_1
      GROUP "MIPARE"
      STATUS ON
      PROJECTION
         "init=epsg:4326"
      END
      TYPE POLYGON
      DATA "data/Scale_S57_Shapefile/25000/DE416020/MIPARE/A/MIPARE.shp"
      PROCESSING "CLOSE_CONNECTION=DEFER"
      PROCESSING "LABEL_NO_CLIP=ON"
      MINSCALEDENOM 0
      MAXSCALEDENOM 24999
      CLASS
         EXPRESSION ([CATMPA] == 2)
         STYLE
            SIZE 10
            OUTLINECOLOR 200 0 255
            SYMBOL mipare_torea
         END
      END
      CLASS
         EXPRESSION (([CATMPA] == 3) || ([CATMPA] == 4))
         STYLE
            SIZE 10
            OUTLINECOLOR 200 0 255
            SYMBOL mipare_subea
         END
      END
      CLASS
         STYLE
            SIZE 1
            OUTLINECOLOR 200 0 255
            SYMBOL dashed_line
         END
      END
   END
    
   LAYER
      NAME MIPARE_A_1
      GROUP "MIPARE"
      STATUS ON
      PROJECTION
         "init=epsg:4326"
      END
      TYPE POLYGON
      DATA "data/Scale_S57_Shapefile/45000/DE316001/MIPARE/A/MIPARE.shp"
      PROCESSING "CLOSE_CONNECTION=DEFER"
      PROCESSING "LABEL_NO_CLIP=ON"
      MINSCALEDENOM 25000
      MAXSCALEDENOM 499999
      CLASS
         EXPRESSION ([CATMPA] == 2)
         STYLE
            SIZE 10
            OUTLINECOLOR 200 0 255
            SYMBOL mipare_torea
         END
      END
      CLASS
         EXPRESSION (([CATMPA] == 3) || ([CATMPA] == 4))
         STYLE
            SIZE 10
            OUTLINECOLOR 200 0 255
            SYMBOL mipare_subea
         END
      END
      CLASS
         STYLE
            SIZE 1
            OUTLINECOLOR 200 0 255
            SYMBOL dashed_line
         END
      END
   END
END

And here is the Exception wich I get:

Mapserver message:
 Did not get image data back. 
URL:
http://127.0.0.1:8181/cgi-bin/mapserv?MAP=/opt/fgs2/www/htdocs/nautical.map&transparent=true&layers=MIPARE_A_1&styles=&service=WMS&width=612&format=image%2Fpng&request=GetMap&height=612&srs=EPSG%3A900913&version=1.1.1&bbox=1104629.71327%2C7248943.79384%2C1116324.57859%2C7260638.65917
Content-Type Header: application/vnd.ogc.se_xml
Response: 
<?xml version='1.0' encoding="ISO-8859-1" standalone="no" ?>
<!DOCTYPE ServiceExceptionReport SYSTEM
"http://schemas.opengis.net/wms/1.1.1/exception_1_1_1.dtd">
<ServiceExceptionReport version="1.1.1">
<ServiceException code="LayerNotDefined">
msWMSLoadGetMapParams(): WMS server error. Invalid layer(s) given in the
LAYERS parameter.
</ServiceException>
</ServiceExceptionReport>

  File "/opt/fgs2/www/htdocs/tilecache-2.10/TileCache/Service.py", line 323,
in cgiHandler
    format, image = service.dispatchRequest( params, path_info, req_method,
host )
  File "/opt/fgs2/www/htdocs/tilecache-2.10/TileCache/Service.py", line 226,
in dispatchRequest
    (format, data) = self.renderTile(t, params.has_key('FORCE'))
  File "/opt/fgs2/www/htdocs/tilecache-2.10/TileCache/Service.py", line 138,
in renderTile
    data = layer.render(tile, force=force)
  File "/opt/fgs2/www/htdocs/tilecache-2.10/TileCache/Layer.py", line 435,
in render
    image = self.renderMetaTile(metatile, tile)
  File "/opt/fgs2/www/htdocs/tilecache-2.10/TileCache/Layer.py", line 395,
in renderMetaTile
    data = self.renderTile(metatile)
  File "/opt/fgs2/www/htdocs/tilecache-2.10/TileCache/Layers/WMS.py", line
29, in renderTile
    tile.data, response = wms.fetch()
  File "/opt/fgs2/www/htdocs/tilecache-2.10/TileCache/Client.py", line 68,
in fetch
    raise Exception("Did not get image data back. \nURL: %s\nContent-Type
Header: %s\nResponse: \n%s" % (self.url(), ctype, data))

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