我试图按照this example获取MQL查询中返回的'cursor'值。虽然my attempt会产生以下错误：
{
"error": {
"errors": [
{
"domain": "global",
"reason": "invalid",
"message": "cursor is invalid.",
"locationType": "other",
"location": "parameters.cursor"
}
],
"code": 400,
"message": "cursor is invalid."
}
}