Error in starting worker thread in MultiTaskSampler

[Supriya0530]

Hello,
I setup code from the main branch and I get the following error for all the Gym environments in the solution:
Traceback (most recent call last):
File "C:\RESEARCH\APPS\pytorch-maml-rl-master\train.py", line 135, in
main(args)
File "C:\RESEARCH\APPS\pytorch-maml-rl-master\train.py", line 64, in main
sampler = MultiTaskSampler(config['env-name'],
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\RESEARCH\APPS\pytorch-maml-rl-master\maml_rl\samplers\multi_task_sampler.py", line 108, in init
worker.start()
File "c:\Users\conne\anaconda3\envs\MAMLRL_ENV\Lib\multiprocessing\process.py", line 121, in start
self._popen = self._Popen(self)
^^^^^^^^^^^^^^^^^
File "c:\Users\conne\anaconda3\envs\MAMLRL_ENV\Lib\multiprocessing\context.py", line 224, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "c:\Users\conne\anaconda3\envs\MAMLRL_ENV\Lib\multiprocessing\context.py", line 336, in _Popen
return Popen(process_obj)
^^^^^^^^^^^^^^^^^^
File "c:\Users\conne\anaconda3\envs\MAMLRL_ENV\Lib\multiprocessing\popen_spawn_win32.py", line 94, in init
reduction.dump(process_obj, to_child)
File "c:\Users\conne\anaconda3\envs\MAMLRL_ENV\Lib\multiprocessing\reduction.py", line 60, in dump
ForkingPickler(file, protocol).dump(obj)
AttributeError: Can't pickle local object 'make_env.._make_env'

It is coming in the line , worker.start() in the class, MultiTaskSampler(Sampler). I have setup Python ver. 3.11.7, Numpy ver. 1.26.4, Pytorch ver. 2.0.0 and Gym ver. 0.15.3.