今天实盘突然出现下面报错，
JSONDecodeError Traceback (most recent call last)
313 """
314 event_source = DatafeedEventSource()
--> 315 btest = research_trade(
316 'tick6.1.1.1',
317 source_code,
/opt/conda/lib/python3.8/site-packages/mgquant_mod_mindgo/utils/pyvalid.pyc in decorator_wrapper(*func_args, **func_kwargs)
/opt/conda/lib/python3.8/site-packages/mgquant_mod_realtime/research_api.pyc in research_trade(name, source_code, capital_base, frequency, stock_market, benchmark, trade_api, signal_mode, dry_run, recover_dt, event_source)
/opt/conda/lib/python3.8/site-packages/mgquant_mod_realtime/realtime.pyc in realtime_trade(stock_market, frequency, dry_run, recover_dt, **kwargs)
/opt/conda/lib/python3.8/site-packages/mgquant_mod_realtime/realtime.pyc in start(self, target_time, recover_dt)
/opt/conda/lib/python3.8/site-packages/mgquant_mod_realtime/realtime.pyc in run(self, recover_dt)
/opt/conda/lib/python3.8/site-packages/mgquant_mod_realtime/realtime.pyc in get_task_async(self, tick_dt)
/opt/conda/lib/python3.8/site-packages/mgquant_mod_realtime/realtime.pyc in setitem(self, name, value)
/opt/conda/lib/python3.8/site-packages/mgquant_mod_realtime/realtime.pyc in read(self)
/opt/conda/lib/python3.8/json/init.py in loads(s, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
355 parse_int is None and parse_float is None and
356 parse_constant is None and object_pairs_hook is None and not kw):
--> 357 return _default_decoder.decode(s)
358 if cls is None:
359 cls = JSONDecoder
/opt/conda/lib/python3.8/json/decoder.py in decode(self, s, _w)
335
336 """
--> 337 obj, end = self.raw_decode(s, idx=_w(s, 0).end())
338 end = _w(s, end).end()
339 if end != len(s):
/opt/conda/lib/python3.8/json/decoder.py in raw_decode(self, s, idx)
353 obj, end = self.scan_once(s, idx)
354 except StopIteration as err:
--> 355 raise JSONDecodeError("Expecting value", s, err.value) from None
356 return obj, end
JSONDecodeError: Expecting value: line 1 column 1 (char 0)