[Python] Anomaly detection using ADTK

i want to carry out an anomaly detection model for a simple dataset but it keeps giving me an error. the image shows the error

below is the python code i used

import pandas as pd
import matplotlib.pyplot as plt
import numpy as np

#Importing the Anomaly Detection Toolkit
from adtk.data import validate_series
from adtk.visualization import plot
from adtk.detector import ThresholdAD

data = pd.read_csv('space_weather_unified.csv')
data["event_type"] = pd.to_datetime(data["event_type"])
data = data.set_index("event_type")
data = data['kp_index'].fillna(0.00)
data = data.astype(float)


threshold_detector = ThresholdAD(high=3.0)
anomalies = threshold_detector.detect(data)
plot(data, anomaly=anomalies, anomaly_color='red', anomaly_tag="marker")
plt.show()

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