Error in Prestashop

[panthe]

Hi,
I've found this module and I've found it very clean and good but don't work well in Prestashop 1.4.5
When I click on like button ever appear a message of error that say:

The page failed to provide a valid list of administrators. It needs to specify the administrators using either a "fb:app_id" meta tag, or using a "fb:admins" meta tag to specify a comma-delimited list of Facebook users.

I've debug it with http://developers.facebook.com/tools/debug and appears only this warning:
Inferred Property: The og:locale property should be explicitly provided, even if a value can be inferred from other tags.

I post to you the graphic URL of my page:
{
"url": "http://www.giochiforever.com/19-cod-5378-stelle-fluorescenti-.html",
"type": "product",
"title": "COD. 5378 Stelle fluorescenti pz 102",
"image": [
{
"url": "http://www.giochiforever.com/19-66-medium/cod-5378-stelle-fluorescenti-.jpg"
}
],
"description": "Stelle fluorescenti conf. 102 pz",
"data": {
"type": "product"
},
"updated_time": "2011-10-22T20:46:08+0000",
"id": "10150506082908868"
}

Have you some idea about this error?
Thanks
Luca