如何解决AttributeError: Can only use .dt accessor with datetimelike values的问题

def get_daily_income_line(df):
    orders_df = df[df['pay_time'].notna()]
    orders_df['pay_time'] = orders_df['pay_time'].dt.tz_convert('Asia/Shanghai')
    orders_df['pay_time'] = orders_df['pay_time'].dt.date
    start_date, end_date = orders_df['pay_time'].min(), orders_df['pay_time'].max()
    dates_index = pd.date_range(start_date, end_date)
    daily_income = pd.Series(index=dates_index, dtype='float64').fillna(0.0)
    groupby_pay_time_df = orders_df[['pay_time', 'price']].groupby('pay_time').sum()
    daily_income += groupby_pay_time_df['price']
    daily_income = daily_income.fillna(0.0)
    x_data = [dt.strftime("%Y-%m-%d") for dt in daily_income.index]
    y_data = daily_income.values.tolist()
    return {
        'x_data': x_data,
        'y_data': y_data
    }