[OpenLayers-Users] Vector layer -> drawFeature

[ontwerp at limotec.be]

Hello

I have a map with 2 layers. The base layer is an XYZ layer and a vector layer for the features.
This is the constuctor of the vector layer:

var renderer = OpenLayers.Util.getParameters(window.location.href).renderer;
renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers; 

markers = new OpenLayers.Layer.Vector("Markers",
    {
        styleMap: new OpenLayers.StyleMap({
            externalGraphic: '@Url.Content("~/Images/Icons/Optical.png")',
            graphicOpacity: 1.0,
            graphicWidth: 30,
            graphicHeight: 30,
            graphicYOffset: -15,
            graphicXOffset: -15
        }),
        renderOptions: { yOrdering: true },
        renderers: renderer
    }
);
map.addLayer(markers);

After I add a feature it won’t draw on the map. I get this error: feature.geometry.getBounds is not a function
The error occures in the drawFeature function.

How can I solve it?
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