Error with Views and GMap

I'm getting the following error under the "Live Preview" of a view I'm trying to create using GMap and data imported into some CCK fields. The error is

warning: parse_url(http://) [function.parse-url]: Unable to parse URL in E:\Applications\drupal\sites\all\modules\views\handlers\views_handler_field.inc on line 507

Does anybody have any idea what might be causing this?

Amy