获取行情超时

运行系统自带的程序没有问题，运行自己写的程序总是报获取行情超时
程序异常：获取SHFE.bu1912的行情超时，请检查客户端及网络是否正常，且合约代码填写正确，line271
SYMBOL = ‘SHFE.bu1912’ # CZCE.SPD CF001&CF005
GRID_AMOUNT = 4
START_STD = 0
LENGTH = 60
api = TqApi()
grid_region_long = [1.5] * GRID_AMOUNT
grid_region_short = [1.5] * GRID_AMOUNT
grid_volume_longe = [i for i in range(GRID_AMOUNT+1)]
grid_volume_short = [i for i in range(GRID_AMOUNT+1)]
grid_std_long = [reduce(lambda x,y:x-y,grid_region_long[:i] , START_STD) for i in range(GRID_AMOUNT+1)]
grid_std_short = [reduce(lambda x,y:x+y,grid_region_long[:i] , START_STD) for i in range(GRID_AMOUNT+1)]

quote = api.get_quote(SYMBOL)
target_pos = TargetPosTask(api,SYMBOL)
Klines = api.get_kline_serial(SYMBOL,60*60)