Invalid Order Signature

[DmitryMihaylov]

I send this object to your API
{ method: 'POST',
url: 'https://api.idex.market/order',
json:
{ tokenBuy: '0xCdCFc0f66c522Fd086A1b725ea3c0Eeb9F9e8814',
amountBuy: '800000000000000000000',
tokenSell: '0x0000000000000000000000000000000000000000',
amountSell: '150000000000000000',
address: '0x8aFa6c139bf20a67B0fb716Df2113A41B13DF575',
nonce: 3,
expires: 1542202760165,
v: 27,
r: '0xbca1ee19d47d78bed7be14ae0484208065f7b227bd361d8eebabbfdd089a8c31',
s: '0x1b9bc8b5cb0d152cd93c13586ddea82e27452e5a08e4b91951d4e405a4577132' } }

This is Server Answer
{ error: 'Invalid order signature. Please try again.' }

Some orders from the same program sends succesful

{ method: 'POST',
url: 'https://api.idex.market/order',
json:
{ tokenBuy: '0x0D8775F648430679A709E98d2b0Cb6250d2887EF',
amountBuy: '348600000000000000000',
tokenSell: '0x0000000000000000000000000000000000000000',
amountSell: '150000000000000000',
address: '0x8aFa6c139bf20a67B0fb716Df2113A41B13DF575',
nonce: 1,
expires: 1542201756302,
v: 28,
r: '0x7c14b1e553acd6fe5504aed96603796c92de2d07c1cec8dacf387e7550066f89',
s: '0x5ab390de65ed3daddba213f83f497f83d18e0f632d2b2b70dbb83c704a6a9e99' } }
IT is answer:
{ orderNumber: 176110836,
orderHash: '0xb377a2a76de60b888ee8849842e77b5674a8c90f1c5d52447ecefe50424e54ee',
timestamp: 1542201761,
price: '0.000430292598967298',
amount: '348.6',
total: '0.15',
type: 'buy',
params:
{ tokenBuy: '0x0d8775f648430679a709e98d2b0cb6250d2887ef',
buyPrecision: 18,
amountBuy: '348600000000000000000',
tokenSell: '0x0000000000000000000000000000000000000000',
sellPrecision: 18,
amountSell: '150000000000000000',
expires: 1542201756302,
nonce: 1,
user: '0x8afa6c139bf20a67b0fb716df2113a41b13df575' } }

Whats wrong I do? Sing code is from your example