RLException: Invalid <arg> tag: environment variable 'GYM_GAZEBO_WORLD_CIRCUIT2' is not set.
Arg xml is <arg default="$(env GYM_GAZEBO_WORLD_CIRCUIT2)" name="world_file"/>
The traceback for the exception was written to the log file
環境變量沒有正確配置。
解決辦法：
export GYM_GAZEBO_WORLD_CIRCUIT2=/home/hwang/gym-gazebo/gym_gazebo/envs/assets/worlds/circuit2.world
然後source ~/.zshrc或者~/.bashrc
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