你好 我遇到一个问题老是 提示是nan

mkdictw = C.get_market_data_ex(['low', 'high','close'], A.stock, period='1mon', count=17, dividend_type='front', end_time=today,fill_data=True,subscribe = False)

hightw=np.array(mkdictw[gupiao]['high']) lowsw = np.array(mkdictw[gupiao]['low']) closesw = np.array(mkdictw[gupiao]['close']) cci_listm = talib.CCI(hightw,lowsw,closesw,timeperiod=14)

出错运行不了提示 talib.cci nan