Error in sending app invitation in ios to facebook friends

Question

I am trying to send app invitation to facebook friends but getting the following error

app invite error:Error Domain=com.facebook.sdk.core Code=9 "The operation couldn’t be completed. (com.facebook.sdk.core error 9.)"

below is my code

-(IBAction)buttonTapped:(id)sender {
FBSDKAppInviteContent *content = [[FBSDKAppInviteContent alloc] init];
content.appLinkURL = [NSURL URLWithString:@"https://fb.me/115385318808986"];
[FBSDKAppInviteDialog showWithContent:content
                             delegate:self];

}

#pragma mark - FBSDKAppInviteDialogDelegate

- (void)appInviteDialog:(FBSDKAppInviteDialog *)appInviteDialog didCompleteWithResults:(NSDictionary *)results
{
  // Intentionally no-op.
}

- (void)appInviteDialog:(FBSDKAppInviteDialog *)appInviteDialog didFailWithError:(NSError *)error
{
NSLog(@"app invite error:%@", error);
NSString *message = error.userInfo[FBSDKErrorLocalizedDescriptionKey] ?:
@"There was a problem sending the invite, please try again later.";
NSString *title = error.userInfo[FBSDKErrorLocalizedTitleKey] ?: @"Oops!";

[[[UIAlertView alloc] initWithTitle:title message:message delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show];
}

and when I am trying to print the error.userInfo it shows a blank dictionary. Please guide.

Answer 1

For facebook sdk 4.0 and later

at first create an applink.

FBSDKAppInviteContent *content =[[FBSDKAppInviteContent alloc] init];
content.appLinkURL = [NSURL     URLWithString:@"https://www.google.com/myapplink"];
//optionally set previewImageURL 

content.appInvitePreviewImageURL = [NSURL URLWithString:@"https://www.google.com/my_invite_image.jpg"];

// present the dialog. Assumes self implements protocol `FBSDKAppInviteDialogDelegate`
[FBSDKAppInviteDialog showWithContent:content
                         delegate:self];

see this link https://developers.facebook.com/docs/app-invites/ios

EDIT:

when you create an app link and you have to provide an url scheme,this url scheme added in your project info plist.after that you add a face book canvas platform in face book developer setting page,and provide a canvas url and save it.

Answer 2

If you've been looking everywhere like me to figure out why it's not working, turns out Facebook is deprecating App Invites and will completely stop working as of 2/6/2018:

https://developers.facebook.com/blog/post/2017/11/07/changes-developer-offerings/

Answer 3

I had this error as well. What fixed it was adding

[FBSDKAppEvents activateApp];

in applicationDidBecomeActive:(UIApplication *)application

within the appDelegate. See also https://developers.facebook.com/docs/app-events/ios#appActivation