Error on credential api (tradebuy & buylimit)

[lisyoen]

I tried to buy with credential api (like a bittrex.tradebuy & buylimit) And I got this error message.

code tradebuy

bittrex.tradebuy({
  MarketName: 'BTC-LTC',
  OrderType: 'LIMIT',
  Quantity: 0.1,
  Rate: 0.01012,
  TimeInEffect: 'IMMEDIATE_OR_CANCEL',
  ConditionType: 'NONE', 
  Target: 0, 
}, function( data, err ) {
  console.log( data );
});

error message requested from https://bittrex.com/Api/v2.0/key/market/TradeBuy?apikey={{hiding}}&nonce=1512881475002&MarketName=BTC-LTC&OrderType=LIMIT&Quantity=0.1&Rate=0.01012&TimeInEffect=IMMEDIATE_OR_CANCEL&ConditionType=NONE&Target=0 in: 3.141s { success: false, message: 'INVALID_SIGNATURE', result: null }

code buylimit

bittrex.buylimit({market: 'BTC-LTC', quantity: 0.1, rate: 0.01012}, function (err, data) {
  if (err) {
    return console.error(err);
  }
  console.log(data);
  var uuid = data.result.uuid;
});

error message requested from https://bittrex.com/api/v1.1/market/buylimit?apikey={{hiding}}&nonce=1512883548131&market=BTC-LTC&quantity=0.1&rate=0.01012 in: 1.469s { success: false, message: 'INVALID_SIGNATURE', result: null }

(API_KEY has all permissions except WITHDRAW) What did I miss?

P.S I live in Korea GMT+9. Could it make a timezone problem?

[lisyoen]

I found solution from this issue https://github.com/ericsomdahl/python-bittrex/issues/23 thanks everyone!