问题如题，因为策略涉及到所有主力合约，每次手动订阅所有品种的主力合约太繁琐了，请问是否有自动订阅的方式呢？谢谢

自己写的策略，在组合策略策略模块运行时报错如下，有哪位知道如何解决吗？

wefa: 触发异常已停止
Traceback (most recent call last):
File "D:\vnpy-2.7.0\vnpy\app\portfolio_strategy\engine.py", line 331, in call_strategy_func
func(params)
File "D:\vnpy-2.7.0\vnpy\app\portfolio_strategy\strategies\trend__strategy.py", line 104, in on_tick
self.pbg.update_tick(tick)
File "D:\vnpy-2.7.0\vnpy\app\portfolio_strategy\utility.py", line 31, in update_tick
bar.datetime = bar.datetime.replace(second=0, microsecond=0)
AttributeError: 'tuple' object has no attribute 'datetime'

自己写的策略，在组合策略策略模块运行时报错如下，有哪位知道如何解决吗？ 在utility的PortfolioBarGenerator类中的确没有初始化定义self.interval

wefa: 触发异常已停止
Traceback (most recent call last):
File "D:\vnpy-2.7.0\vnpy\app\portfolio_strategy\engine.py", line 331, in call_strategy_func
func(params)
File "D:\vnpy-2.7.0\vnpy\app\portfolio_strategy\strategies\trend__strategy.py", line 104, in on_tick
self.pbg.update_tick(tick)
File "D:\vnpy-2.7.0\vnpy\app\portfolio_strategy\utility.py", line 36, in update_tick
interval=self.interval,
AttributeError: 'PortfolioBarGenerator' object has no attribute 'interval'

自己写的策略，在CTA策略模块进行初始化时报错如下，有哪位知道如何解决吗

[tesdf1] 触发异常已停止
Traceback (most recent call last):
File "D:\python3.7\lib\site-packages\pandas\core\indexes\base.py", line 2646, in get_loc
return self._engine.get_loc(key)
File "pandas_libs\index.pyx", line 111, in pandas._libs.index.IndexEngine.get_loc
File "pandas_libs\index.pyx", line 138, in pandas._libs.index.IndexEngine.get_loc
File "pandas_libs\hashtable_class_helper.pxi", line 998, in pandas._libs.hashtable.Int64HashTable.get_item
File "pandas_libs\hashtable_class_helper.pxi", line 1005, in pandas._libs.hashtable.Int64HashTable.get_item
KeyError: 31

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "D:\python3.7\lib\site-packages\vnpy_ctastrategy\engine.py", line 623, in call_strategy_func
func()
File "D:\python3.7\lib\site-packages\vnpy_ctastrategy\strategies\gen_signal_strategy.py", line 129, in on_init
self.load_bar(1)
File "D:\python3.7\lib\site-packages\vnpy_ctastrategy\template.py", line 306, in load_bar
use_database
File "D:\python3.7\lib\site-packages\vnpy_ctastrategy\engine.py", line 590, in load_bar
callback(bar)
File "D:\python3.7\lib\site-packages\vnpy_ctastrategy\strategies\gen_signal_strategy.py", line 173, in on_bar
self.short(bar.close_price, abs(self.df.loc[self.grid2, 'position']))
File "D:\python3.7\lib\site-packages\pandas\core\indexing.py", line 1762, in getitem
return self._getitem_tuple(key)
File "D:\python3.7\lib\site-packages\pandas\core\indexing.py", line 1272, in _getitem_tuple
return self._getitem_lowerdim(tup)
File "D:\python3.7\lib\site-packages\pandas\core\indexing.py", line 1389, in _getitem_lowerdim
section = self._getitem_axis(key, axis=i)
File "D:\python3.7\lib\site-packages\pandas\core\indexing.py", line 1965, in _getitem_axis
return self._get_label(key, axis=axis)
File "D:\python3.7\lib\site-packages\pandas\core\indexing.py", line 625, in _get_label
return self.obj._xs(label, axis=axis)
File "D:\python3.7\lib\site-packages\pandas\core\generic.py", line 3537, in xs
loc = self.index.get_loc(key)
File "D:\python3.7\lib\site-packages\pandas\core\indexes\base.py", line 2648, in get_loc
return self._engine.get_loc(self._maybe_cast_indexer(key))
File "pandas_libs\index.pyx", line 111, in pandas._libs.index.IndexEngine.get_loc
File "pandas_libs\index.pyx", line 138, in pandas._libs.index.IndexEngine.get_loc
File "pandas_libs\hashtable_class_helper.pxi", line 998, in pandas._libs.hashtable.Int64HashTable.get_item
File "pandas_libs\hashtable_class_helper.pxi", line 1005, in pandas._libs.hashtable.Int64HashTable.get_item
KeyError: 31