IndexError: deque index out of range

[you]

I was running sample program ibtest.py with these parameters and got
a 'Index Error: deque index out of range' error after received ~1100 ticks and ~180 ticks for the two data feed.... this error can be re-produced very often but not every time... wonder if anyone has seen this before...

>> python ibtest.py --port 4001 --data0 AUD.USD-CASH-IDEALPRO --timeframe Seconds --compression 10 --data1 AUD.USD-CASH-IDEALPRO --timeframe1 Seconds --compression1 60 --replay --usestore --trade --notifyall --debug

:~/dev/t1-p3.5/src/myalgo$ Traceback (most recent call last):
  File "ibtestorg.py", line 467, in <module>
    runstrategy()
  File "ibtestorg.py", line 275, in runstrategy
    cerebro.run(exactbars=args.exactbars)
  File "/home/x/dev/t1-p3.5/lib/python3.5/site-packages/backtrader/cerebro.py", line 810, in run
    runstrat = self.runstrategies(iterstrat)
  File "/home/x/dev/t1-p3.5/lib/python3.5/site-packages/backtrader/cerebro.py", line 940, in runstrategies
    self._runnext(runstrats)
  File "/home/x/dev/t1-p3.5/lib/python3.5/site-packages/backtrader/cerebro.py", line 1256, in _runnext
    strat._next()
  File "/home/x/dev/t1-p3.5/lib/python3.5/site-packages/backtrader/strategy.py", line 296, in _next
    super(Strategy, self)._next()
  File "/home/x/dev/t1-p3.5/lib/python3.5/site-packages/backtrader/lineiterator.py", line 236, in _next
    clock_len = self._clk_update()
  File "/home/x/dev/t1-p3.5/lib/python3.5/site-packages/backtrader/strategy.py", line 290, in _clk_update
    for d in self.datas if len(d))
  File "/home/x/dev/t1-p3.5/lib/python3.5/site-packages/backtrader/strategy.py", line 290, in <genexpr>
    for d in self.datas if len(d))
  File "/home/x/dev/t1-p3.5/lib/python3.5/site-packages/backtrader/linebuffer.py", line 163, in __getitem__
    return self.array[self.idx + ago]
IndexError: deque index out of range

[backtrader]

You are using replay and mixing several data feeds. The current core is known (@RandyT has been the driving force) to have some weaknesses with replay.

The suggestion for such a mix would be to use resample