Trouble with DummyVecEnv constructor with gym_super_mario_bros

Question

SUMMARY: All I want to do is use the DummyVecEnv constructor to wrap my gym environment i.e. env = DummyVecEnv([lambda: env]) but I keep getting errors when doing this. Currently using https://pypi.org/project/gym-super-mario-bros/ as a gym wrapper for Super Mario. I have a feeling I am misunderstanding what arguments I am supposed to provide the constructor but I am new to python and am having difficulty understanding what I'm missing.

I'm having difficulty using the DummyVecEnv constructor around the environment that I'm returning from gym_super_mario_bros.make(). I keep getting an error "You tried to create multiple environments, but the function to create them returned the same instance instead of creating different objects".

I initially tried to wrap my environment in a DummyVecEnv the way I have seen it done on many forums:

env = gym_super_mario_bros.make("SuperMarioBros-v0")     
env = JoypadSpace(env, SIMPLE_MOVEMENT)     
env = GrayScaleObservation(env, keep_dim=True) 
env = DummyVecEnv([lambda: env]) #This line errors

but I got this error:

File c:\Users\truem\AppData\Local\Programs\Python\Python311\Lib\site-packages\stable_baselines3\common\vec_env\dummy_vec_env.py:30, in DummyVecEnv.init(self, env_fns)
     29 def init(self, env_fns: List[Callable[[], gym.Env]]):
---> 30     self.envs = [_patch_env(fn()) for fn in env_fns]
     31     if len(set([id(env.unwrapped) for env in self.envs])) != len(self.envs):
     32         raise ValueError(
     33             "You tried to create multiple environments, but the function to create them returned the same instance "
     34             "instead of creating different objects. "(...)
     39             "Please read https://github.com/DLR-RM/stable-baselines3/issues/1151 for more information."
     40         )

So then I tried to follow the fix listed at the github link as well as the examples provided in the documentation

https://stable-baselines.readthedocs.io/en/master/guide/examples.html

I went ahead and created a new helper function create_default_environment which should create new env instances and return them, but despite this it still isn't working.

This is how my code looks now:

#wrap my env creation in a function
def create_default_environment():
     newEnv = gym_super_mario_bros.make("SuperMarioBros-v0")     
     newEnv = JoypadSpace(newEnv, SIMPLE_MOVEMENT)     
     return GrayScaleObservation(newEnv, keep_dim=True) 
#Create lambda in a list which calls helper function
env = DummyVecEnv([lambda: create_default_environment()]) #still failing

I went ahead and wrapped my initial env construction inside a helper function create_default_environment() which I have verified returns a new env instance with every call. I then used that wrapper to plug into the DummyVecEnv constructor: env = DummyVecEnv([lambda: create_default_environment()]) But the compiler still complains that my list of functions passed in does not return new instances. I've been trying to emulate what I see in the example code that baselines provides:

from stable_baselines.common.vec_env import DummyVecEnv, VecNormalize
from stable_baselines import PPO2

env = DummyVecEnv(\[lambda: gym.make("HalfCheetahBulletEnv-v0")]) #why does this work but mine does not?

but I'm not sure what I'm doing wrong. New to python so excuse me if there's something obvious I'm missing.