Error uploading zip file on dropbox

Error uploading zip file on dropbox

-(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];
}
i am getting this warning
[WARNING] DropboxSDK: error making request to
/1/files_put/dropbox/CurrentDocument.zip - (403) Forbidden