I have the same question. How can I solve it? error is Error Domain=kCFErrorDomainCFNetwork Code=310 "(null)" UserInfo={_NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask .<529>, _kCFStreamErrorDomainKey=4, _NSURLErrorRelatedURLSessionTaskErrorKey=( "LocalDataTask .<529>" ), _kCFStreamErrorCodeKey=-2102}