"Nonce must be greater" problem in Poloniex

Hi, first of all, amazing project, thanks 😃

It seems that Poloniex is failing somehow, I wrote the following supersimple code:

import ccxt
polo   = ccxt.poloniex({
    'apiKey': 'MYKEY',
    'secret': 'MYSECRET',
})
print(polo.fetch_balance())

And it gives this error:

$ python bot.py 
Traceback (most recent call last):
  File "bot.py", line 36, in <module>
    print(polo.fetch_balance())
  File "/Library/Python/2.7/site-packages/ccxt/exchanges.py", line 15845, in fetch_balance
    'account': 'all',
  File "/Library/Python/2.7/site-packages/ccxt/exchanges.py", line 16134, in request
    response = self.fetch2(path, api, method, params, headers, body)
  File "/Library/Python/2.7/site-packages/ccxt/exchange.py", line 228, in fetch2
    return self.fetch(request['url'], request['method'], request['headers'], request['body'])
  File "/Library/Python/2.7/site-packages/ccxt/exchange.py", line 266, in fetch
    self.handle_rest_errors(e, e.code, text, url, method)
  File "/Library/Python/2.7/site-packages/ccxt/exchange.py", line 314, in handle_rest_errors
    self.raise_error(error, url, method, exception if exception else str(http_status_code), details)
  File "/Library/Python/2.7/site-packages/ccxt/exchange.py", line 213, in raise_error
    details,
ccxt.errors.ExchangeNotAvailable: poloniex POST https://poloniex.com/tradingApi 422   {"error":"Nonce must be greater than 150619298582500. You provided 1507295961."}

It is working correctly with other exchanges, so I guess my setup is correct.

[werewere]

Ok, thanks for your help, is solved now 😃

[dancju]

@kroitor thank you for replying! I found another solution: put all coroutines into one single thread.

May I ask another question? I only create one event loop in one thread. Why do I see multiple process with different pids?