在进行多线程任务的时候，提示api_master.wait_update()错误，不知道怎么回事

########################
import threading
from tqsdk import TqApi, TqSim, TargetPosTask
from tqsdk import TqAccount

class WorkerThread(threading.Thread):
def __init__(self, api, near_contract, far_contract, my_ask_price_list):
threading.Thread.__init__(self)
self.api = api
self.near_contract = near_contract
self.far_contract = far_contract
self.my_ask_price_list = my_ask_price_list

def run(self):
near_contract_id = “SHFE.” + self.near_contract
far_contract_id = “SHFE.” + self.far_contract
quote_near = self.api.get_quote(near_contract_id)
quote_far = self.api.get_quote(far_contract_id)

i = 0
while i < len(self.my_ask_price_list):
my_askprice = self.my_ask_price_list[i]
order_far = self.api.insert_order(symbol=far_contract_id, direction="SELL", offset="OPEN",
limit_price=my_askprice, volume=1)
self.api.wait_update()

while order_far.status == 'ALIVE':
self.api.wait_update()
print("跳出循环")

order_near = self.api.insert_order(symbol=near_contract_id, direction="BUY", offset="OPEN",
limit_price=quote_near.ask_price1, volume=1)
self.api.wait_update()
while order_near.status == 'ALIVE':
self.api.wait_update()
i = i + 1

if __name__ == "__main__":
#########################################################################################参数设置
near_contract1 = "pb2001"
far_contract1 = "pb2002"
my_ask_price_list1 = [14855, 14890]

my_corp = "simnow"
my_account = " "
my_pass = " "

#########################################################################################参数设置
api_master = TqApi(TqAccount(my_corp, my_account, my_pass))

account = api_master.get_account()
print("可用资金", account.available)

# Create new threads
thread1 = WorkerThread(api_master.copy(), near_contract1, far_contract1, my_ask_price_list1)
# thread2 = WorkerThread(api_master.copy(), near_contract2, far_contract2, my_ask_price_list2)
# thread3 = WorkerThread(api_master.copy(), near_contract3, far_contract3, my_ask_price_list2)

# Start new Threads
thread1.start()
# thread2.start()
# thread3.start()
while True:
api_master.wait_update()

simnow账号，等待1个小时就会出现这种情况。每次都会出现。