[Tilecache] couldn't calculate tile index for laye

[GMail]

Greetings,
    I've got problem using openlayers+tilecache+ms4w. Codes follow:

OpenLayers:
        var options4326 = {
                 //maxResolution: 1,
                 //maxZoomLevel: 8,
                 maxExtent: new OpenLayers.Bounds(109.659395,20.208809,117.205135,25.452341),
                 projection:"EPSG:4326",
                 controls: [new OpenLayers.Control.MouseDefaults()]
                 };
        var map = new OpenLayers.Map('map', options4326);

        var gdhk_tilecache = new OpenLayers.Layer.WMS(
            "WMS (EPSG 4326); tilecache",
            "http://localhost/tilecache/tilecache.cgi", {
              layers: 'gdhk',
              format: 'image/gif'}
            );

tilecache.cfg:
[gdhk]
type=WMSLayer
url=http://localhost/cgi-bin/en/mapserv
extension=gif
#bbox=109.659395,20.208809,117.205135,25.452341
#levels=8

It always return errors "couldn't calculate tile index for layer", but I can see the image by:
http://localhost/tilecache/tilecache.cgi?layers=gdhk&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&SRS=EPSG:4326&WIDTH=256&HEIGHT=256&BBOX=109.659395,20.208809,117.205135,25.452341

I've tried to comment/uncomment those lines, but nothing changes.

Could anyone help?
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