Fb error validating application
In this article Mudassar Ahmed Khan has explained the issue allow Definition='Machine To Application' beyond application level which occurs when you run your Website application or project in Visual Studio, its cause and solution.
Here Mudassar Ahmed Khan has explained how to fetch and import Facebook Friends and Contacts along with their profile pictures using Face Book Graph API in ASP. Here Mudassar Ahmed Khan has explain with a tutorial and example, how to get authenticate Face Book user's account and get like User Id, Profile Image, User Name, Name and Email in ASP.
Net using Face Book Graph API and Free ASPSnippets Face Book API.
The fetched images will be displayed as Image Gallery using ASP. On each image click a larger image will be displayed as Modal Popup with Light Box effect using j Query.
Net Website using the Free ASPSnippets Facebook API and Face Book Graph API.
Here Mudassar Ahmed Khan has explained how to import Face Book Photo Albums and their pictures or images in ASP.
In each case, the API will return an HTTP 400 status code, a code and a subcode in a JSON body explaining the nature of the error.
I have a joomla module which shows facebook group/page wall feeds by using Graph Api.
To get this information you can use our debug tool, or you can use the API endpoint.
To use the API, you can issue a Graph API request: time passed to your App along with the access token, your app may only learn that a given token has become invalid is when you attempt to make a request to the API.
User access tokens are generally obtained via a login dialog and require a person to permit your app to obtain one.
This kind of access token is needed to modify and read the app settings. It is generated using a pre-agreed secret between the app and Facebook and is then used during calls that change app-wide settings.