Unable to create trade error

[phacts]

I've recently updated with the develop branch (about two hours ago), as a number of the issues I found last night have already been fixed. Everything has been running smoothly, including a full trade. This is all in with "dry_run": true set in my config.

After identifying a trade of BTC-XRP, I'm seeing an error repeated twice in the console:

2017-11-15 21:24:28,211 - freqtrade - INFO - Checking buy signals to create a new trade with stake_amount: 0.050000 ...
2017-11-15 21:26:16,135 - freqtrade - ERROR - Unable to create trade
Traceback (most recent call last):
  File "./freqtrade/main.py", line 70, in _process
    trade = create_trade(float(_CONF['stake_amount']))
  File "./freqtrade/main.py", line 223, in create_trade
    if get_buy_signal(_pair):
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/freqtrade/analyze.py", line 99, in get_buy_signal
    dataframe = analyze_ticker(pair)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/freqtrade/analyze.py", line 82, in analyze_ticker
    ticker_hist = get_ticker_history(pair)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/.env/lib/python3.6/site-packages/cachetools/__init__.py", line 46, in wrapper
    v = func(*args, **kwargs)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/freqtrade/exchange/__init__.py", line 133, in get_ticker_history
    return _API.get_ticker_history(pair, tick_interval)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/freqtrade/exchange/bittrex.py", line 103, in get_ticker_history
    data = _API_V2.get_candles(pair.replace('_', '-'), interval)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/.env/src/python-bittrex/bittrex/bittrex.py", line 794, in get_candles
    }, protection=PROTECTION_PUB)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/.env/src/python-bittrex/bittrex/bittrex.py", line 154, in _api_query
    return self.dispatch(request_url, apisign)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/.env/src/python-bittrex/bittrex/bittrex.py", line 77, in using_requests
    headers={"apisign": apisign}
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/.env/lib/python3.6/site-packages/requests/models.py", line 892, in json
    return complexjson.loads(self.text, **kwargs)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/__init__.py", line 354, in loads
    return _default_decoder.decode(s)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/decoder.py", line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/decoder.py", line 357, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
2017-11-15 21:26:16,346 - freqtrade - INFO - Checking buy signals to create a new trade with stake_amount: 0.050000 ...
2017-11-15 21:26:23,034 - freqtrade - INFO - *BITTREX:* Buying [BTC/XRP](https://www.bittrex.com/Market/Index?MarketName=BTC-XRP) with limit `0.00002919`
2017-11-15 21:26:26,300 - freqtrade - INFO - Checking buy signals to create a new trade with stake_amount: 0.050000 ...
2017-11-15 21:26:35,587 - freqtrade - INFO - Checked all whitelisted currencies. Found no suitable entry positions for buying. Will keep looking ...
2017-11-15 21:26:35,588 - freqtrade - INFO - Got open order for Trade(id=2, pair=BTC_XRP, amount=1708.63309352518, open_rate=2.919e-05, open_since=seconds ago)
2017-11-15 21:26:36,344 - freqtrade - INFO - Checking buy signals to create a new trade with stake_amount: 0.050000 ...
2017-11-15 21:26:36,974 - freqtrade - INFO - Checked all whitelisted currencies. Found no suitable entry positions for buying. Will keep looking ...
2017-11-15 21:26:39,015 - freqtrade.rpc.telegram - INFO - Executing handler: _status for chat_id: 497298357
2017-11-15 21:26:46,314 - freqtrade - INFO - Checking buy signals to create a new trade with stake_amount: 0.050000 ...
2017-11-15 21:26:46,969 - freqtrade - INFO - Checked all whitelisted currencies. Found no suitable entry positions for buying. Will keep looking ...
2017-11-15 21:26:56,392 - freqtrade - INFO - Checking buy signals to create a new trade with stake_amount: 0.050000 ...
2017-11-15 21:27:12,990 - freqtrade - ERROR - Unable to create trade
Traceback (most recent call last):
  File "./freqtrade/main.py", line 70, in _process
    trade = create_trade(float(_CONF['stake_amount']))
  File "./freqtrade/main.py", line 223, in create_trade
    if get_buy_signal(_pair):
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/freqtrade/analyze.py", line 99, in get_buy_signal
    dataframe = analyze_ticker(pair)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/freqtrade/analyze.py", line 82, in analyze_ticker
    ticker_hist = get_ticker_history(pair)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/.env/lib/python3.6/site-packages/cachetools/__init__.py", line 46, in wrapper
    v = func(*args, **kwargs)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/freqtrade/exchange/__init__.py", line 133, in get_ticker_history
    return _API.get_ticker_history(pair, tick_interval)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/freqtrade/exchange/bittrex.py", line 103, in get_ticker_history
    data = _API_V2.get_candles(pair.replace('_', '-'), interval)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/.env/src/python-bittrex/bittrex/bittrex.py", line 794, in get_candles
    }, protection=PROTECTION_PUB)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/.env/src/python-bittrex/bittrex/bittrex.py", line 154, in _api_query
    return self.dispatch(request_url, apisign)
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/.env/src/python-bittrex/bittrex/bittrex.py", line 77, in using_requests
    headers={"apisign": apisign}
  File "/Users/sgrimm/dev/cryptos/bots/freqtrade/.env/lib/python3.6/site-packages/requests/models.py", line 892, in json
    return complexjson.loads(self.text, **kwargs)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/__init__.py", line 354, in loads
    return _default_decoder.decode(s)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/decoder.py", line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/decoder.py", line 357, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
2017-11-15 21:27:14,055 - freqtrade - INFO - Checking buy signals to create a new trade with stake_amount: 0.050000 ...

The app seems to think that the trade went through... and, since I'm running a dry run, I can't confirm that it actually has. This may just be another API inconsistency.

So far, this is the only error I've seen in the latest develop branch.

[rybolov]

I get this too. In production, the trade does not go through.

[gcarq]

I've modified the exception handling for this a little bit, it will be logged as warning followed by a 30 sec sleep. Unfortunately we cannot do much more until bittrex fixes their API.