在VN Trader下载期货连续主力合约，提示错误，是什么原因啊？

代码内容提示如下：

Traceback (most recent call last):

File "C:\veighna_studio\Lib\site-packages\vnpy_datamanager\ui\widget.py", line 605, in download

count = self.engine.download\_bar\_data(symbol, exchange, interval, start, self.output)

File "C:\veighna_studio\Lib\site-packages\vnpy_datamanager\engine.py", line 213, in download_bar_data

data = self.datafeed.query\_bar\_history(req, output)

File "C:\veighna_studio\Lib\site-packages\vnpy_xt\xt_datafeed.py", line 120, in query_bar_history

df: DataFrame = get\_history\_df(req, output)

                \~\~\~\~\~\~\~\~\~\~\~\~\~\~^^^^^^^^^^^^^

File "C:\veighna_studio\Lib\site-packages\vnpy_xt\xt_datafeed.py", line 289, in get_history_df

data: dict = xtdata.get\_local\_data([], [xt\_symbol], xt\_interval, start, end, -1, "front\_ratio", False)      # 默认等比前复权

             \~\~\~\~\~\~\~\~\~\~\~\~\~\~\~\~\~\~\~\~\~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "C:\veighna_studio\Lib\site-packages\xtquant\xtdata.py", line 881, in get_local_data

return \_get\_market\_data\_ex\_ori\_221207(field\_list, stock\_list, period, start\_time, end\_time, count,

                                      dividend\_type, fill\_data, False, data\_dir)

File "C:\veighna_studio\Lib\site-packages\xtquant\xtdata.py", line 623, in _get_market_data_ex_ori_221207

ret = client.get\_market\_data3(field\_list, stock\_list, period, start\_time, end\_time, count, dividend\_type, fill\_data, 'v4', enable\_read\_from\_local,

                              enable\_read\_from\_server, debug\_mode, data\_dir)

RuntimeError: invalid stockCode: b00.DF.DF

根据官网提示的，就是用这个代码下载，为什么不对呢？

请问是哪里出了问题？问微信客服都不回复问题，求大神帮我解决