Facebook SDK API IOS Error when posting to user's wall

Question

I am getting the following error when trying to post to the user's Facebook wall and I can't seem to find the source. Anyone have some insight on this issue?

2012-08-29 22:14:38.490 CanP[405:707] Error: HTTP status code: 400
2012-08-29 22:14:38.494 CanP[405:707] FBSDKLog: Response <#1111> <Error>:
The operation couldn’t be completed. (com.facebook.sdk error 5.)

The method that is run that should post the message to the facebook wall is as follows:

[FBSettings setLoggingBehavior:[NSSet setWithObjects:
                                FBLoggingBehaviorFBRequests,
                                nil]];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[facebook accessToken] forKey:@"FBAccessTokenKey"];
[defaults setObject:[facebook expirationDate] forKey:@"FBExpirationDateKey"];
[defaults synchronize];

NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                               @"My test app", @"name",
                               @"http://www.google.com", @"link",
                               @"FBTestApp app for iPhone!", @"caption",
                               @"This is a description of my app", @"description",
                               @"Hello!\n\nThis is a test message\nfrom my test iPhone app!", @"message",
                               nil];

// Publish.
// This is the most important method that you call. It does the actual job, the message posting.
[facebook requestWithGraphPath:@"me/feed" andParams:params andHttpMethod:@"POST" andDelegate:self];

Answer 1

As suggested by C Abernathy, you should "place a breakpoint at the error line and take a look at the error variable then drill down to a dictionary named userInfo that should contain a much more readable error message."

For those of us testing a new Facebook integration, the most common problem is likely to be shown in the error.userInfo "com.facebook.sdk.ParsedJSONResponseKey":

message = "(#506) Duplicate status message";

Vary the text you use to test your Facebook integration, and you may find that your code is working just fine!