Update app.py

app.py

@@ -105,7 +105,7 @@ def load_data(upd_file):
     # Read CSV or Excel file
     if upd_file.name.endswith('.csv'):
         return pd.read_csv(upd_file)
-    elif upd_file.name.endswith('.xlsx') or file.name.endswith('.xls'):
+    elif upd_file.name.endswith('.xlsx') or upd_file.name.endswith('.xls'):
         return pd.read_excel(upd_file)
     else:
         raise ValueError("Unsupported file format. Only CSV and Excel files are supported.")