1. Double check that you provide the correct token to application
2. Double check the following information are corect before run the facebook_authorization.php
//edit with your info
$app_id = "xxxxxxxxxxxxx"; //given when you created app
$app_secret = "YYYYYYYYYYY"; //given when you created app
$site_url = "http://www.yourdomain.com/facebook_authorization.php"; //full path to location of this file.
3. Double check that you provide correct information to the update_product.php
//AutoFacebook
$app_id = "xxxxxxxxxxxx"; //given when you created app
$app_secret = "YYYYYYYYYYYY"; //given when you created app
$page_id = "KKKKKKKKKKKKK"; //obtained from running facebook_authorization.php from your browser
$page_token = "VERY LONG STRING YOU GET FROM facebook_authorization.php"; //long number obtained from facebook_authorization.php
4. Double check Application ---> Settings ---> Migrations ---> ON
If you follow all the above and try not to mix the information from page_id and page_token with other pages you might created in facebook everything will work perfect.
If you keep getting the same error i suggest to delete facebook aplication and create it again
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