I am having gladLoadGL error when I trying to use offscreen = mujoco.MjrContext(self.model, mujoco.mjtFontScale.mjFONTSCALE_150)

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Hi,

I'm a student and I'm trying to use MuJoCo for crane automation simulation with reinforcement learnging

I'm looking for some help with gladLoadGL error occuring on mujoco.MjrContext().

I implemented four camearas on my object and I am trying to get images from the camera.

it works when I directly use

model = mujoco.MjModel.from_xml_path(file_path)
offscreen = mujoco.MjrContext(model, mujoco.mjtFontScale.mjFONTSCALE_151)

I get images and can put the input into a cnn model

but the error occurs when I am trying to call it in class like below

CustomMjocoEnv(gym.Env):
def reset(self):

  mujoco.mj_resetData(self.model, self.data)
  mujoco.mj_forward(self.model, self.data)
  return self._get_obs()

def _get_obs():
...
offscreen = mujoco.MjrContext(self.model, mujoco.mjtFontScale.mjFONTSCALE_151)
...

Defining model inside the _get_obs doesnt fix the error. I typed os.environ['MUJOCO_GL] = 'elg'
below is my nvidia version
NVIDIA-SMI 535.183.01 Driver Version: 535.183.01 CUDA Version: 12.2

Thank you for reading and I am looking forward to your kind help