Fix by providing a key argument to

table_prep.py

@@ -99,8 +99,9 @@ def load_table_data(repo_id, hf_token, table_data_dir):
                         
                         if 'sheets' in table_data:
                             sorted_sheets = sorted(
-                                table_data['sheets'], 
-                                )
+                                table_data['sheets'],
+                                key=lambda sheet: sheet.get('table_number', '')  # or use 'table_number'
+                            )
                             
                             for sheet in sorted_sheets:
                                 sheet['document'] = document_id