[Users] GeoExt Uncaught ReferenceError (form.js)

[ELKHATTABI Imane]

Hello everyone,

I'm using   GeoExt and Openlayers to visualise basic wms layer on a map.

With Firebug , It shows error : "Uncaught ReferenceError: OpenLayers is not
defined " , in the file  geoext/lib/GeoExt/widget/form.js

The error comes from this line:

 GeoExt.form.toFilter.FILTER_MAP = {
    "eq": OpenLayers.Filter.Comparison.EQUAL_TO,



Any hint or help would be highly apreciated.
Thanks in advance
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