preview of mapfile does not work

[Marcel Krautkrämer]

hi list
my mapfile is:
"MAP
 SIZE 600 450

EXTENT -22 29 45 80

 IMAGECOLOR 180 180 250
 UNITS DD


#REFERENCE
LEGEND
        STATUS EMBED
        POSITION LL
        TRANSPARENT TRUE
END

 SCALEBAR
  STATUS EMBED
  UNITS KILOMETERS
  INTERVALS 4
  POSITION LR
  TRANSPARENT TRUE
  #IMAGECOLOR 255 255 255
  #COLOR  0 0 0
 
  OUTLINECOLOR 0 0 0
#  SIZE 200 2
SIZE 150 2
END
WEB
        TEMPLATE template.html
        IMAGEPATH "C:\ms4w\tmp\ms_tmp\"
        IMAGEURL "\ms_tmp/"
        METADATA
END

LAYER
        METADATA
         "wms_title "bEISPIEL"

        NAME countries
        TYPE POLYGON
        STATUS DEFAULT
        DATA countries_simpl
        LABELITEM 'NAME'
        CLASSITEM 'NAME'
        CLASS
                NAME "Switzerland"
                EXPRESSION 'Switzerland'
                STYLE
# OUTLINECOLOR 240 80 100
OUTLINECOLOR 10 10 10
                        COLOR 240 80 100
# COLOR 10 10 10
                END
                LABEL
                        SIZE LARGE
                        MINFEATURESIZE 40
                END
        END
        CLASS
                NAME "OTHER COUNTRIES"
                EXPRESSION ('[NAME]' ne 'Switzerland')
                STYLE
                        OUTLINECOLOR 10 10 10
                        COLOR 220 220 220
                END
END
END
END
"
I try to open it in maplab, mapedit but the preview says only:
Warning: [MapServer Error]: msDrawMap(): Failed to draw layer named 'countries'. in C:\ms4w\apps\maplab-2.2.1\htdocs\mapedit\preview.php on line 472

Warning: [MapServer Error]: msSHPOpenFile(): (/ms4w/apps///maplab-2.2.1/tutorial/data/countries_simpl) in C:\ms4w\apps\maplab-2.2.1\htdocs\mapedit\preview.php on line 472

Warning: [MapServer Error]: msSHPOpenFile(): (/ms4w/apps///maplab-2.2.1/tutorial/data/countries_simpl) in C:\ms4w\apps\maplab-2.2.1\htdocs\mapedit\preview.php on line 472

Warning: [MapServer Error]: msFreeHashItems(): Can't free NULL table in C:\ms4w\apps\maplab-2.2.1\htdocs\mapedit\preview.php on line 472

Warning: [MapServer Error]: msFreeHashItems(): Can't free NULL table in C:\ms4w\apps\maplab-2.2.1\htdocs\mapedit\preview.php on line 472

Warning: [MapServer Error]: msInsertHashTable: Invalid hash table or key in C:\ms4w\apps\maplab-2.2.1\htdocs\mapedit\preview.php on line 472

Fatal error: Call to a member function on a non-object in C:\ms4w\apps\maplab-2.2.1\htdocs\mapedit\preview.php on line 477

i get the map with:
http://localhost/cgi-bin/mapserv.exe?map=/ms4w/apps/tutorial/htdocs/k4.map&layer=countries&mode=map
(ok it is a different path but the same mapfile)
i am new in maplab, so please help me further.

thanks in advance
marcel
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