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rosnode ping error

Hello to all,

I am trying to follow the tutorials on ROS wiki.

I came across an error concerning the rosnode ping command.

I am getting the following error:

root@ubuntu:~# rosnode ping my_turtle rosnode: node is [/my_turtle] pinging /my_turtle with a timeout of 3.0s Traceback (most recent call last): File "/opt/ros/electric/ros/bin/rosnode", line 35, in <module> rosnode.rosnodemain() File "/opt/ros/electric/stacks/ros_comm/tools/rosnode/src/", line 713, in rosnodemain sys.exit(_rosnode_cmd_ping(argv) or 0) File "/opt/ros/electric/stacks/ros_comm/tools/rosnode/src/", line 681, in _rosnode_cmd_ping rosnode_ping(node_name, verbose=True, max_count=options.ping_count) File "/opt/ros/electric/stacks/ros_comm/tools/rosnode/src/", line 292, in rosnode_ping errnum, msg = e ValueError: need more than 1 value to unpack root@ubuntu:~#

Any clues?