Traceback (most recent call last):
File "c:\vnstudio\lib\site-packages\vnpy_datamanager\ui\widget.py", line 609, in download
count = self.engine.download_bar_data(symbol, exchange, interval, start)
File "c:\vnstudio\lib\site-packages\vnpy_datamanager\engine.py", line 213, in download_bar_data
data = self.datafeed.query_bar_history(req)
File "c:\vnstudio\lib\site-packages\vnpy_tushare\tushare_datafeed.py", line 144, in query_bar_history
freq=ts_interval
File "c:\vnstudio\lib\site-packages\tushare\pro\data_pro.py", line 196, in pro_bar
raise IOError('ERROR.')
OSError: ERROR.