internal server error my ass

main.py

@@ -38,22 +38,21 @@ def files_in_folder(path: str):
             for f in path_glob
         ],
         columns=["path", "size", "mtime", "folder"],
-    ).sort_values(["folder", "path"], ascending=[False, True])
+    )
+
+    res.loc[-1] = [
+        f"<a href=/files/{ROOT.parent}/>..</a>",
+        "",
+        "",
+        2,
+    ]
+    res.sort_values(["folder", "path"], ascending=[False, True], inplace=True)
 
     res["path"] = res.apply(
         lambda x: f"<a href=/files/{path}{x.path}{'/' if x.folder else ''}>{x.path}</a>",
         axis=1,
     )
 
-    res.loc[-1] = [
-        (
-            f"<a href=/files/{folder.parent}/>..</a>",
-            "",
-            "",
-            True,
-        )
-    ]
-
     table = to_html_datatable(
         df=res.drop(columns="folder"),
         classes="display nowrap compact",