[OpenLayers-Users] maxExtent error

[raul1113]

I'm dealing with issue for a long time with any luck to solve it.

I have a WMS server of my own with different layers on it, but I have to
include the metacarta layer from internet otherwise I get this error:

maxExtent is null
http://192.168.1.5:9090/SMMS/wms/client/OpenLayers.js
Line 840

And then I have to click in the max zoom button of OpenLayers tools to get
the complete world view and then find the part I'm interested. Ive tried
different solutions posted by users of the mailing list without luck. This
is my code, is a little long but could be useful to anyone who can help me.
Thanks in advance.

<div style="width:50em; height:35em;" id="map"></div>
                        <script defer="defer" type="text/javascript">

                        layers_array = new Array();
                        var lon = -87.29301;
                        var lat = 13.33182;
                        var zoom = 10;
                   
            var options = {
                                                        numZoomLevels: 16,
                                                    maxResolution: "auto",
                            units: 'meters',
                            maxExtent: new OpenLayers.Bounds(-180, -90, 180,
90)
                          };

           var map = new OpenLayers.Map( 'map' , options);
           
           OpenLayers.IMAGE_RELOAD_ATTEMPTS = 5;
           OpenLayers.Util.onImageLoadErrorColor = "transparent";
                 
                        var request = OpenLayers.Request.GET(
                        {url:
"dir/wms.php?VERSION=1.1.1&REQUEST=GetCapabilities&SERVICE=WMS",
                        success: function(response){
                                                        var XMLformat = new
OpenLayers.Format.XML();
                                                        var xml =
XMLformat.read(response.responseText);
                                                        var CAPformat = new
OpenLayers.Format.WMSCapabilities();
                                                        var cap =
CAPformat.read(xml);
                                                       
                                                        for (var i=0;
i<cap.capability.layers.length; i++) {
                                                                layer =
cap.capability.layers[i];
                                                                                       
                        layers_array[i] = new OpenLayers.Layer.WMS(
layer.name,
                                                                                               
"dir/wms.php",
                                                                                               
{'layers': layer.name, transparent: "true", format: "image/png", 'viewer':
'OpenLayers'}
                                                                                               
);
                                                                                       
}

                                                                                       
}
                                                               
map.addLayer(layers_array[i]);
                                                        }
                                                       
                                                },
                                failure: function(response){
                                                       
alert(response.status);
                                                       
alert("GetCapabilities failed");
                                                                }
                        });
                       
             layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
                 "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'});
            map.addLayer(layer);/*WITHOUT THIS I GET THE ERROR MENTIONED
BEFORE*/
                                               
                map.addControl(new OpenLayers.Control.LayerSwitcher());
                map.addControl( new OpenLayers.Control.MousePosition());
                map.addControl( new OpenLayers.Control.MouseToolbar());
                map.addControl( new OpenLayers.Control.OverviewMap());
       
        map.setCenter(new OpenLayers.LonLat(lon, lat), zoom);
</script> 
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