object(stdClass)#4 (5) {
  ["errcode"]=>
  int(88)
  ["sub_code"]=>
  string(5) "40000"
  ["sub_msg"]=>
  string(21) "access_token is blank"
  ["errmsg"]=>
  string(59) "ding talk error[subcode=40000,submsg=access_token is blank]"
  ["request_id"]=>
  string(13) "15r4fljzx229y"
}