Function to filter and apply calculation error in python

Question

import pandas as pd

def bonus_calculation(dataframe):

df2 = pd.read_csv("C:\\Users\\ThisI\\employees_update.csv")

active_employees['bonus'] = df2[df2["end_date"].isnull()].loc[:, "salary"] * 1.2

return active_employees

bonus_calculation(active_employees)

I get this error message: :7: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using.loc[row_indexer,col_indexer] = value instead

See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy active_employees['bonus'] = df2[df2["end_date"].isnull()].loc[:, "salary"] * 1.2

Can someone help me on this?