You need a map to show. Have you copied or moved the gismaps_map directory?
http://vuurtooren.nl/wp-content/uploads/vuurtooren-806-806.jpg00adminhttp://vuurtooren.nl/wp-content/uploads/vuurtooren-806-806.jpgadmin2017-03-14 16:24:392017-03-14 16:36:57Openlayers example
