打开vnstation弹出登陆窗口，断电了，再开电脑想打开vnstation就不弹窗口直接报错
Traceback (most recent call last):
File "C:\vnstudio\Scripts\vnstation-script.pyw", line 11, in <module>
load_entry_point('vnstation==2.4.4', 'gui_scripts', 'vnstation')()
File "C:\vnstudio\lib\site-packages\vnstation\run.py", line 68, in main
return Main().exec()
File "C:\vnstudio\lib\site-packages\vnstation\run.py", line 40, in exec
self.login_widget = login_widget = LoginWidget()
File "C:\vnstudio\lib\site-packages\vnstation\ui\login\login_widget.py", line 26, in init
self.load_setting()
File "C:\vnstudio\lib\site-packages\vnstation\ui\login\login_widget.py", line 70, in load_setting
self.setting = load_json(self.filename)
File "C:\vnstudio\lib\site-packages\vnstation\utility.py", line 35, in load_json
data = json.load(f)
File "C:\vnstudio\lib\json__init.py", line 296, in load
parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
File "C:\vnstudio\lib\json\init__.py", line 348, in loads
return _default_decoder.decode(s)
File "C:\vnstudio\lib\json\decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "C:\vnstudio\lib\json\decoder.py", line 355, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
请问大家如何是好，需要修改什么文件，不想再重装vnstation了，谢谢

11:11:24 初始化CTA回测引擎
11:11:24 策略文件加载完成
11:11:24 RQData数据接口初始化成功
11:11:56 ----------------------------------------
11:11:56 rb88.SHFE-1h开始下载历史数据
11:11:56 数据下载失败，触发异常：
Traceback (most recent call last):
File "C:\vnstudio\lib\site-packages\vnpy\app\cta_backtester\engine.py", line 365, in run_downloading
data = rqdata_client.query_history(req)
File "C:\vnstudio\lib\site-packages\vnpy\trader\rqdata.py", line 136, in query_history
adjust_type="none"
File "C:\vnstudio\lib\site-packages\rqdatac\decorators.py", line 131, in wrap
return func(args, **kwargs)
File "C:\vnstudio\lib\site-packages\rqdatac\services\get_price.py", line 117, in get_price
pf = get_minbar(order_book_ids, start_date, end_date, fields, duration, market)
File "C:\vnstudio\lib\site-packages\rqdatac\services\get_price.py", line 433, in get_minbar
"get_minbar_v", order_book_ids, start_date, end_date, fields, duration, market
File "C:\vnstudio\lib\site-packages\rqdatac\decorators.py", line 59, in wrap
return func(args, **kwargs)
File "C:\vnstudio\lib\site-packages\rqdatac\connection_pool.py", line 25, in execute
with self._get_connection() as conn:
File "C:\vnstudio\lib\contextlib.py", line 112, in enter
return next(self.gen)
File "C:\vnstudio\lib\site-packages\rqdatac\connection_pool.py", line 36, in _get_connection
conn = self._ensure_connection()
File "C:\vnstudio\lib\site-packages\rqdatac\connection_pool.py", line 52, in _ensure_connection
if conn.is_nomal():
AttributeError: 'Connection' object has no attribute 'is_nomal'

11:15:42 ----------------------------------------
11:15:42 rb88.SHFE-d开始下载历史数据
11:15:42 rb88.SHFE-d历史数据下载完成
11:16:13 ----------------------------------------
11:16:13 rb88.SHFE-1m开始下载历史数据
11:16:13 数据下载失败，触发异常：
Traceback (most recent call last):
File "C:\vnstudio\lib\site-packages\vnpy\app\cta_backtester\engine.py", line 365, in run_downloading
data = rqdata_client.query_history(req)
File "C:\vnstudio\lib\site-packages\vnpy\trader\rqdata.py", line 136, in query_history
adjust_type="none"
File "C:\vnstudio\lib\site-packages\rqdatac\decorators.py", line 131, in wrap
return func(args, **kwargs)
File "C:\vnstudio\lib\site-packages\rqdatac\services\get_price.py", line 117, in get_price
pf = get_minbar(order_book_ids, start_date, end_date, fields, duration, market)
File "C:\vnstudio\lib\site-packages\rqdatac\services\get_price.py", line 433, in get_minbar
"get_minbar_v", order_book_ids, start_date, end_date, fields, duration, market
File "C:\vnstudio\lib\site-packages\rqdatac\decorators.py", line 59, in wrap
return func(args, **kwargs)
File "C:\vnstudio\lib\site-packages\rqdatac\connection_pool.py", line 25, in execute
with self._get_connection() as conn:
File "C:\vnstudio\lib\contextlib.py", line 112, in enter
return next(self.gen)
File "C:\vnstudio\lib\site-packages\rqdatac\connection_pool.py", line 36, in _get_connection
conn = self._ensure_connection()
File "C:\vnstudio\lib\site-packages\rqdatac\connection_pool.py", line 52, in _ensure_connection
if conn.is_nomal():
AttributeError: 'Connection' object has no attribute 'is_nomal'

时间在10月3日11点左右，下载螺纹日线2009.10.3-2019.10.3数据正常，
而1h和1m数据下载过程中都报相同的异常，缩短下载数据的范围至2016.10.3-2019.10.3也一样，请问大家是不是也遇到这个情况，求解

Traceback (most recent call last):
File "C:\vnstudio\lib\site-packages\vnpy\trader\ui\mainwindow.py", line 253, in closeEvent
self.main_engine.close()
File "C:\vnstudio\lib\site-packages\vnpy\trader\engine.py", line 223, in close
gateway.close()
File "C:\vnstudio\lib\site-packages\vnpy\gateway\rpc\rpc_gateway.py", line 104, in close
self.client.join()
File "C:\vnstudio\lib\site-packages\vnpy\rpc__init.py", line 240, in join
if self.thread.isAlive():
AttributeError: 'NoneType' object has no attribute 'isAlive'

更新后关闭程序就弹出这个窗口了，麻烦大佬们给点建议，谢谢