在dropbox上传zip文件时出错

Question

-(void) uploadToDropbox {

   NSString *targetFile = PATH_ZIP_FILE;

   DropboxListingView *dropboxView = [[DropboxListingView alloc] initWithPath:@"/" withDelegate:self mode:ImportExportModeExport];
   dropboxView.uploadFiles = [NSArray arrayWithObject:targetFile];

   UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:dropboxView];

   [self presentViewController:navigationController animated:YES completion:nil];
}

我收到此警告

  

[警告] DropboxSDK：发出错误请求   /1/files_put/dropbox/CurrentDocument.zip - （403）Forbidden