Hi,
It's the problem with your code, instead of using dash (-) after df1, you have to use equal to sign (=), in order to store your dataframe inside 'df1'.
Use this:
df1 = read.csv("C:/Users/Ify D/Desktop/IfyDataClasscustomer_churn.csv")
This will definitely work, please revert to me if it doesn't work.