I have problem to run these two lines: it's gave me this error (ValueError: Grouper for 'Loan' not 1-dimensional)

Please your help is appreciated

#C : # To create two separate pivot tables, one for Loan as function of Online and one for Loan as function of CC, you can use the pivot_table() method twice, once with Online as the column variable and once with CC as the column variable.

pivot_table_online = train_data.pivot_table(values='Loan', index='Loan', columns='Online', aggfunc='count')

pivot_table_cc = train_data.pivot_table(values='Loan', index='Loan', columns='CC', aggfunc='count')