Sell orders constanr error

I have constant error while cretaing sell or buy orders, all addressees are seen, but still no sucess
def main():
bot = SimpleBot()
bot.read_config(“config.cfg”)
pw.setNode(node=bot.node, chain=bot.chain)
my_address = pw.Address(privateKey=bot.private_key)

while True:

    A1_A2 = pw.AssetPair(pw.BTC, pw.USD)
    print("%s" % (A1_A2.last()))
    # post a sell order
    TAURC = pw.Asset('H9JWYjBpxkGcbWD2dQh5pqMoqPbqNkHyrdPqNxYxzN6E')
    BTC = pw.Asset('8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS')
    USD = pw.Asset('Ft8X1v1LTa1ABafufpaCWyVj8KkaxUWE6xBhW6sNFJck')
    TAURC_BTC = pw.AssetPair(TAURC, BTC)
    TAURC_USD = pw.AssetPair(TAURC, USD)
    amt = 100
    prc = 100/float(A1_A2.last())
    print("%s" % (prc))
    myOrder = my_address.sell(assetPair=TAURC_USD,amount=100,price=110)

    bot.log("Sleep {0} seconds...".format(bot.seconds_to_sleep))
    sleep(bot.seconds_to_sleep)
    myOrder.cancel()

What error do you get?