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In task_envs_list.py it should be 'openai_ros.task_envs.turtlebot2.turtlebot2_wall:TurtleBot2WallEnv' instead of 'openai_ros:task_envs.turtlebot2.turtlebot2_wall.TurtleBot2WallEnv' (notice the change of position of the colon and periods)

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