Traceback (most recent call last):
File "C:\veighna_elite_simulation\lib\site-packages\vnpy_datamanager\ui\widget.py", line 610, in download
count: int = self.engine.download_bar_data(symbol, exchange, interval, start, self.output)
File "C:\veighna_elite_simulation\lib\site-packages\vnpy_datamanager\engine.py", line 212, in download_bar_data
data: List[BarData] = self.datafeed.query_bar_history(req, output)
File "C:\veighna_elite_simulation\lib\site-packages\vnpy_mcdata\mcdata_datafeed.py", line 114, in query_bar_history
quote_history = self.api.getquotehistory(
File "C:\veighna_elite_simulation\lib\site-packages\icetcore\api.py", line 511, in getquotehistory
if symbol + "-" + str(btype) in self.quoteobj.eventobj.barinterval.keys():
AttributeError: 'NoneType' object has no attribute 'eventobj'
