Mapfile Style issue Mapserver 2

MAP
    NAME ""
    IMAGETYPE PNG
    EXTENT -180 -90 180 90
    MAXSIZE 4096
    SIZE 500 300
    IMAGECOLOR 255 255 255
    PROJECTION
        "proj=longlat"
        "datum=WGS84"
        "no_defs"
    END
    TRANSPARENT ON
    SYMBOL
        NAME "circle"
        TYPE ELLIPSE
        FILLED TRUE
        POINTS
        1 1
        END
    END
    DEBUG 5
    WEB
        METADATA
            "ows_updatesequence" "2022-02-28T00:42:46Z"
            "ows_encoding" "UTF-8"
            "ows_title" "HRDPS Style Mapserver issue"
            "wms_getmap_formatlist" "image/png,image/jpeg"
            "wms_getfeatureinfo_formatlist" "text/plain,application/json"
            "wms_timeformat" "YYYY-MM-DDTHH:MM:SSZ"
            "ows_srs" "EPSG:4326 EPSG:3857 EPSG:900913"
            "ows_enable_request" "*"
            "ows_extent" "-180 -90 180 90"
        END
    END
    LAYER
        NAME "HRDPS.CONTINENTAL.DIAG_PTYPE"
        DEBUG 5
        TYPE RASTER
        TOLERANCE 15
        TEMPLATE "ttt.html"
        PROJECTION
         "proj=stere"
         "lat_0=90"
         "lat_ts=60"
         "lon_0=252"
         "x_0=0"
         "y_0=0"
         "R=6371229"
         "units=m"
         "no_defs"
        END
        DATA 'CMC_hrdps_continental_PTYPE_SFC_0_ps2.5km_2022022800_P001-00.grib2'
        METADATA
            "ows_title" "HRDPS.DIAG - Instantaneous precipitation type"
            "wcs_label" "HRDPS.DIAG - Instantaneous precipitation type"
            "wcs_rangeset_name" "Default Range"
            "wcs_rangeset_label" "Default Range"
            "ows_include_items" "all"
            "ows_extent" "-2097877 -5740639 4342123 -2100639"
            "ows_geomtype" "Geometry"
            "wms_timedefault" "2022-02-28T01:00:00Z"
            "geomet_ows_http_max_age" "3600"
            "ows_size" "2576 1456"
        END
        CLASSGROUP "INSTPRECIPITATIONTYPE"
        CLASS
            NAME "Rain"
            GROUP "INSTPRECIPITATIONTYPE"
            EXPRESSION ([pixel] >= 1.0 AND [pixel] < 2.0)
            STYLE
             COLOR 0 221 0
            END
        END
        CLASS
            NAME "Rain-Snow"
            GROUP "INSTPRECIPITATIONTYPE"
            EXPRESSION ([pixel] >= 2.0 AND [pixel] < 3.0)
            STYLE
             COLOR 238 170 0
            END
        END
        CLASS
            NAME "Freezing-Rain"
            GROUP "INSTPRECIPITATIONTYPE"
            EXPRESSION ([pixel] >= 3.0 AND [pixel] < 4.0)
            STYLE
             COLOR 255 0 0
            END
        END
        CLASS
            NAME "Ice-Pellets"
            GROUP "INSTPRECIPITATIONTYPE"
            EXPRESSION ([pixel] >= 4.0 AND [pixel] < 5.0)
            STYLE
             COLOR 255 0 255
            END
        END
        CLASS
            NAME "Snow"
            GROUP "INSTPRECIPITATIONTYPE"
            EXPRESSION ([pixel] >= 5.0 AND [pixel] < 6.0)
            STYLE
             COLOR 0 238 255
            END
        END
    END
END