行情订阅失败，找不到合约IC1905
IC: 触发异常已停止
Traceback (most recent call last):
File "d:\VNConda\lib\site-packages\vnpy\app\cta_strategy\engine.py", line 582, in call_strategy_func
func()
File "d:\VNConda\lib\site-packages\vnpy\app\cta_strategy\strategies\turtle_signal_strategy.py", line 51, in on_init
self.load_bar(20)
File "d:\VNConda\lib\site-packages\vnpy\app\cta_strategy\template.py", line 218, in load_bar
self.cta_engine.load_bar(self.vt_symbol, days, interval, callback)
File "d:\VNConda\lib\site-packages\vnpy\app\cta_strategy\engine.py", line 537, in load_bar
data = self.query_bar_from_rq(vt_symbol, interval, start, end)
File "d:\VNConda\lib\site-packages\vnpy\app\cta_strategy\engine.py", line 153, in query_bar_from_rq
symbol, exchange_str = vt_symbol.split(".")
ValueError: not enough values to unpack (expected 2, got 1)
