Hi

Thank you very much for your reply The echo $ROS_MASTER_URI command get http://localhost:11311

Beside, I have uninstall the diamondback software. Does that matters?

When I use roswtf command, I got the following error. Please help me with it, thank you.

Loaded plugin tf.tfwtf

No package or stack in context

Static checks summary:

Found 1 warning(s). Warnings are things that may be just fine, but are sometimes at fault

WARNING ROS_HOSTNAME may be incorrect: ROS_HOSTNAME [http://localhost:11311] cannot be resolved to an IP address

Found 1 error(s).

ERROR PYTHONPATH [/opt/ros/electric/ros/core/roslib/src:/opt/ros/electric/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/electric/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/electric/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/electric/ros/core/roslib/src:/opt/ros/electric/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/electric/ros/core/roslib/src:/opt/ros/electric/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:/opt/ros/diamondback/ros/core/roslib/src:] is invalid: Multiple roslib directories in PYTHONPATH (there should only be one)

ROS Master does not appear to be running. Online graph checks will not be run. ROS_MASTER_URI is [http://localhost:11311]