The plugin create a “Search Results” page during the first activation.
If this page does not exist during searches, the “Sorry, no such page.” notification is displayed.
You can create the search result page manually with the following parameters:
Page title: Search Results (or whatever you want)
Permalink: search_gcse
Content: [wp_google_search]
(This page url will be http://yourdomain.com/search_gcse)
We will issue the following version soon (in 1-2 weeks), it will have a new feature, the search result page will be re created if it does not exist during plugin re-activation (deactivation->activation).
If you send us your email address to info@webshoplogic.com, we can send you this version via e-mail (v1.0.2 PRE), and you can try this new feature.