Error message for calling KAMA indicator in Python

import talib def main (: LastBarTime is equal to 0. while ((true): records = exchange.GetRecords BarTime = records[-1][Time] ext.PlotRecords ((records, " ") if LastBarTime!= BarTime: This is the last bartime. KAMA (records, 30) Log ((kama[30]) Log ((kama[kama.length-1]) LastBarTime is the bartime. I tried the KAMA indicator, it works with JS, and it works with py, which returns the error line 9, in main TypeError: Argument real has incorrect type (expected numpy.ndarray, got OOO00) .

In addition, I wrote the implementation code for the KAMA indicator by definition: Direction ((DIR) = closing price - closing price before n days Volatility rate ((VIR) = sum ((abs ((closing price - closing price of the previous trading day), n) Efficiency (ER) = direction / rate of fluctuation So fast is equal to 2 over (n1 + 1) Slowing is equal to 2 / (n2 + 1) Smoothness (CS) = efficiency * (fast - slow) + slow Coefficient (CQ) = smooth * smooth KAMA = index-weighted average (Dynamic Moving Average (Closing Price, Coefficient), 2) (This last step has an introduction in which it is calculated in this way: current KAMA = previous KAMA + SC x (Price - previous KAMA)

I've been searching for a long time and I can't see where the first KAMA came from in the last step, when calculating the first KAMA value, is there no previous KAMA value? Please tell me what to do.