Bookmark data error-handling fails

gistfile1.m

NSError *error;
NSURL *url = [NSURL URLByResolvingBookmarkData:data
                                       options:NSURLBookmarkResolutionWithSecurityScope
                                 relativeToURL:baseURL
                           bookmarkDataIsStale:NULL
                                         error:&error];

NSError *error;
NSData *bookmark = [url bookmarkDataWithOptions:NSURLBookmarkCreationWithSecurityScope
                 includingResourceValuesForKeys:nil
                                  relativeToURL:baseURL
                                          error:&error];