i have been developing webgis application that requires around 45 different layers served from geoserver. I had created openlayers wms layers and added them to geoext, everything works fine till the 35 th layer after i add 36th layer then openlayers gives pink tiles. Here is my snippet:

 WGS84 = new OpenLayers.Projection("EPSG:4326");
             WGS84_google_mercator = new OpenLayers.Projection("EPSG:900913");

             map = new OpenLayers.Map({
                 height: '300px',
                 // allOverlays:true,
                 width: '500px',
                 projection: WGS84_google_mercator, displayProjection: WGS84,
                 maxExtent: new OpenLayers.Bounds(80.0509262084961, 26.348379135131836, 88.20467376708984, 30.4458065032959).transform(new OpenLayers.Projection("EPSG:4326"), WGS84_google_mercator),
                 //  )
                 controls: [
        new OpenLayers.Control.Navigation(),
        new OpenLayers.Control.ArgParser(),
        new OpenLayers.Control.Attribution()
                 ]
             });
nnt_dyear_child_layer=new OpenLayers.Layer.WMS("Child Death Rate Yearly",
                         "hostname1/geoserver/wms", {
                             name: 'nnt_indicator_d',
                             layers: "vpdms:nnt_dyear-child", transparent: true,
                             //viewparams: a,
                         }, {
                             layerid: 'nnt_dyear-child_layer',
                             singleTile: true,
                             visibility: false,
                             group: "Indicators/NNT"
                         });
 nnt_dweek_child_layer=new OpenLayers.Layer.WMS("Child Death Rate Weekly",
                         "hostname1/geoserver/wms", {
                             name: 'nnt_indicator_d',
                             layers: "vpdms:nnt_dweek-child", transparent: true,
                             //viewparams: a,
                         }, {
                             layerid: 'nnt_dweek-child_layer',
                             singleTile: true,
                             visibility: false,
                             group: "Indicators/NNT"
                         });
map.addLayers([nnt_dweek_child_layer,nnt_dyear_child_layer]);



and finally  a geoext tree to hold the layer list:
tree1 = new GeoExt.ux.tree.LayerTreeBuilder({
                 region: "west",
                // title: "Layers",
                 renderTo: 'layers',
                 width: 240,
                 height:200,
                 autoScroll: true,
                 rootVisible: false,
                 lines: false,
                 enableDD :true,
                 // widget custom properties
                 wmsLegendNodes: true,
                 vectorLegendNodes: true
             });

I have used google base layers. I'm using openlayers 2.11 and geoext 2 Btw i have already read Here and Official Here Any help would be great.

Thanks, Bishrant Adhikari