add in parents=True

app/data.py

@@ -32,7 +32,7 @@ class Data:
             with open(data_path, "rb") as f:
                 self.data = pkl.load(f)
         else:
-            data_path.parent.mkdir(exist_ok=True)
+            data_path.parent.mkdir(parents=True, exist_ok=True)
             with open(data_path, "wb") as f:
                 pkl.dump({}, f)
             self.data = {}