How to solve Error“LinAlgError: 2-th leading minor of the array is not positive definite” in plotting & varying it with 'hue' in sns.kdeplot()?

Question

Here is the code:

import pandas as pd
import seaborn as sns
import matplotlib.pyplot as plt
df1=pd.read_csv(\'file.csv\')
df1[\'s\'] = pd.to_datetime(df1[\'se