FBSDKShareDialog doesn't share Photo without Facebook App installed, IOS

I am using Facebook Sdk 4.0,http://ift.tt/1Gg87hk I am using FBSDKShareDialog to share Photo.It does share Photo if user has installed facebook app, But it fails when user hasn't installed FB App. but they say "If someone doesn't have Facebook app installed it will automatically falls back to a web-based dialog." Idk whats wrong plz help me in sharing photo using FBSDK 4.0.

my code is

FBSDKSharePhoto *photo = [[FBSDKSharePhoto alloc] init];
photo.image = self.capturedImageView.image;
photo.userGenerated = YES;
FBSDKSharePhotoContent *content = [[FBSDKSharePhotoContent alloc] init];
content.photos = @[photo];
[FBSDKShareDialog showFromViewController:self
                             withContent:content
                                delegate:self];

this is erro reportt

Thanx.