error while launching roslaunch ipa_room_exploration room_exploration_client.launch command

[Vikas-106]

RLException: error loading tag:
file does not exist [/opt/ros/noetic/share/cob_default_env_config/envs/!!NO_ROBOT_ENV_SET!!/map.yaml]
XML is
The traceback for the exception was written to the log file
""""
this is the error iam getting when launching the mentioned command , what should i do ?
""""

[ipa-foj]

For the provided default client we assume the environment packages from our standard package to have a base for running the sample code. If you want to use the provided client as-is without alteration, you need to set the ROBOT_ENV environment variable to one of the provided environments (see here)