我想更改类别名称，所以我尝试使用此代码，但是在将名称形式的数字转换为level_names中的名称之后，我得到了一个空图
Level_names = [ 'Not Available', 'Debt Consolidation', 'Home Improvement', 'Business', 'Personal Loan','Student Use', 'Auto', 'Other', 'Baby&Adoption', 'Boat', 'Cosmetic Procedure', 'Engagement Ring',Green Loans', 'Household Expenses', 'Large Purchases', 'Medical/Dental', 'Motorcycle', 'RV', 'Taxes', 'Vacation', 'Wedding Loans']
levels_order = pd.api.types.CategoricalDtype(ordered = True, categories = Level_names)
df['ListingCategory (numeric)'] = df['ListingCategory (numeric)'].astype(levels_order)
order_LC = df['ListingCategory (numeric)'].value_counts().index
sb.countplot(data=df, y='ListingCategory (numeric)', color = colors, order = order_LC );
我的错误是什么？