报错如下：
Traceback (most recent call last):
File "c:\vnstudio\lib\site-packages\vnpy\app\portfolio_manager\ui\widget.py", line 207, in process_trade_event
self.monitor.update_trade(trade)
File "c:\vnstudio\lib\site-packages\vnpy\app\portfolio_manager\ui\widget.py", line 278, in update_trade
reference_cell = BaseCell(trade.reference, trade)
AttributeError: 'TradeData' object has no attribute 'reference'