I'm downloading data from EnsEMBL BioMart mirror and during that process I sometimes get error mentioned above. Is it possible to retry to download file?(other than counting results) And second question(please tell me if I'm right), query_runner->execute(query) will download query from server and query_runner->printRsults() will only print them so I can use e.g. eval on execute() and if error occurs try again to execute query?