如题，
行情记录过程中，数据下载到了哪里。
怎么才能和本地原有的数据接上？

wave_reco_strategy: 触发异常已停止
Traceback (most recent call last):
File "C:\vnstudio\lib\site-packages\vnpy\app\cta_strategy\engine.py", line 556, in call_strategy_func
func()
File "C:\vnstudio\lib\site-packages\vnpy\app\cta_strategy\strategies\wave_reco_strategy.py", line 108, in on_init
self.load_bar(self.init_days)
File "C:\vnstudio\lib\site-packages\vnpy\app\cta_strategy\template.py", line 230, in load_bar
self.cta_engine.load_bar(self.vt_symbol, days, interval, callback)
File "C:\vnstudio\lib\site-packages\vnpy\app\cta_strategy\engine.py", line 507, in load_bar
symbol, exchange = extract_vt_symbol(vt_symbol)
File "C:\vnstudio\lib\site-packages\vnpy\trader\utility.py", line 20, in extract_vt_symbol
symbol, exchange_str = vt_symbol.split('.')
ValueError: not enough values to unpack (expected 2, got 1)

wve_co_strategy: 行情订阅失败，找不到合约j1909

以下代码以前在vnpy1.8中是可以正常跑的，为什么在vnpy2.05中就会报错。

File "C:\vnstudio\lib\site-packages\vnpy\app\cta_strategy\strategies\wave_reco_strategy.py", line 109, in on_init
print(len(init_data))
TypeError: object of type 'NoneType' has no len()

def on_init(self):
"""
Callback when strategy is inited.
"""
self.write_log("策略初始化")

    # 载入历史数据，并采用回放计算的方式初始化策略数值

    init_data = self.load_bar(self.init_days)
    print(len(init_data))

如题，出现以下错误提示：

Traceback (most recent call last):
File "C:\vnstudio\lib\site-packages\vnpy\app\csv_loader\ui\widget.py", line 124, in load_data
datetime_format
File "C:\vnstudio\lib\site-packages\vnpy\app\csv_loader\engine.py", line 137, in load
datetime_format=datetime_format,
File "C:\vnstudio\lib\site-packages\vnpy\app\csv_loader\engine.py", line 105, in load_by_handle
database_manager.save_bar_data(bars)
File "C:\vnstudio\lib\site-packages\vnpy\trader\database\database_sql.py", line 368, in save_bar_data
self.class_bar.save_all(ds)
File "C:\vnstudio\lib\site-packages\vnpy\trader\database\database_sql.py", line 145, in save_all
c).on_conflict_replace().execute()
File "C:\vnstudio\lib\site-packages\peewee.py", line 1785, in inner
return method(self, database, args, **kwargs)
File "C:\vnstudio\lib\site-packages\peewee.py", line 1856, in execute
return self._execute(database)
File "C:\vnstudio\lib\site-packages\peewee.py", line 2571, in _execute
return super(Insert, self)._execute(database)
File "C:\vnstudio\lib\site-packages\peewee.py", line 2320, in _execute
cursor = database.execute(self)
File "C:\vnstudio\lib\site-packages\peewee.py", line 2953, in execute
return self.execute_sql(sql, params, commit=commit)
File "C:\vnstudio\lib\site-packages\peewee.py", line 2947, in execute_sql
self.commit()
File "C:\vnstudio\lib\site-packages\peewee.py", line 2729, in exit
reraise(new_type, new_type(exc_args), traceback)
File "C:\vnstudio\lib\site-packages\peewee.py", line 183, in reraise
raise value.with_traceback(tb)
File "C:\vnstudio\lib\site-packages\peewee.py", line 2940, in execute_sql
cursor.execute(sql, params or ())
peewee.IntegrityError: NOT NULL constraint failed: dbbardata.vt_symbol