Hi, I'm trying to optimize hyperparameters for yolov5 model, but I'm getting this error. Could anyone help me resolve this issue?

[W 2024-07-10 10:11:52,691] Trial 0 failed with parameters: {} because of the following error: 
TypeError("'NoneType' object is not subscriptable").

Traceback (most recent call last):
  File "C:\Users\\Desktop\yolov5\venv\lib\site-packages\optuna\study\_optimize.py", line 196, in _run_trial
    value_or_values = func(trial)
  File "C:\Users\\Desktop\yolov5\venv\lib\site-packages\clearml\automation\optuna\optuna.py", line 92, in objective
    objective_metric = objective_metric[0]
TypeError: 'NoneType' object is not subscriptable
[W 2024-07-10 10:11:52,694] Trial 0 failed with value None.
Exception in thread Thread-8:
Traceback (most recent call last):
  File "C:\Users\\AppData\Local\Programs\Python\Python39\lib\threading.py", line 973, in _bootstrap_inner
    self.run()
  File "C:\Users\\AppData\Local\Programs\Python\Python39\lib\threading.py", line 910, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\\Desktop\yolov5\venv\lib\site-packages\clearml\automation\optimization.py", line 1923, in _daemon
    self.optimizer.start()
  File "C:\Users\\Desktop\yolov5\venv\lib\site-packages\clearml\automation\optuna\optuna.py", line 198, in start
    self._study.optimize(
  File "C:\Users\\Desktop\yolov5\venv\lib\site-packages\optuna\study\study.py", line 451, in optimize
    _optimize(
  File "C:\Users\\Desktop\yolov5\venv\lib\site-packages\optuna\study\_optimize.py", line 62, in _optimize
    _optimize_sequential(
  File "C:\Users\\Desktop\yolov5\venv\lib\site-packages\optuna\study\_optimize.py", line 159, in _optimize_sequential
    frozen_trial = _run_trial(study, func, catch)
  File "C:\Users\\Desktop\yolov5\venv\lib\site-packages\optuna\study\_optimize.py", line 247, in _run_trial
    raise func_err
  File "C:\Users\\Desktop\yolov5\venv\lib\site-packages\optuna\study\_optimize.py", line 196, in _run_trial
    value_or_values = func(trial)
  File "C:\Users\\Desktop\yolov5\venv\lib\site-packages\clearml\automation\optuna\optuna.py", line 92, in objective
    objective_metric = objective_metric[0]
TypeError: 'NoneType' object is not subscriptable
`Study.stop` is supposed to be invoked inside an objective function or a callback.
We are done, good bye