Tung Nguyen's profile - activity

it didn't work out. the same issue occur

It's good to see you everywhere, George!

I got the same trouble with launching gazebo for the first time after installing. Now, the Error '[50] tries' and 'no namespace' happened everytime i launch anything gazebo- derived. Any help?

Oh, i see it now! My mistake. I closed the window containing the roscore command, so there's no master initialized at all. Hence the trouble.

Thank you all for tolerating my silliness!

@michikarg: Yep, I check self-ping but i didn't work. So i try Name Resolution as suggested and changed the Hostname and associated Master URI to the System name and the IP address. But nothing seemed to be a good choice so far!

@felix k: No, now it even doesn't make it to the master. ERROR: Unable to communicate with master! Nothing is running yet.

@michikarg: Can you hint me how to access the file etc/hosts? Sorry for that.

@felix k: No, now it even doesn't make it to the master. Nothing is running yet.

@tlinder: Yes, i still can ping the host. Yes, i will be careful next time. For this time, i tried to change the hostname to my System name, IP address but things still doesn't work!

@trinighost: I changed it in the export double command above. Yes, now it returns localhost:11311 for the ROS_MASTER_URI query. Please, help me!

Hi everybody,

This is the first time i'm here, so if my question is too dumb to you, please forgive me. I'm on track "Understanding Nodes" in the beginner tutorials. After changing the name of the turtlesim node via:

$ rosrun turtlesim turtlesim_node __name:=my_turtle

I opened a new terminal and run:

rosnode list

and the results are:

/my_turtle
/turtlesim
/rosout

which is undesired, since the turtlesim node had been changed to my_turtle. The ROS folks knew about it and suggested us to update ROS_HOSTNAME and i did:

$ export ROS_HOSTNAME=localhost
$ export ROS_MASTER_URI=http://localhost:11311

Now not only the problem is still not solved, but another one also occurs. I can't even run the turtlesim node which is previously valid:

$ rosrun turtlesim turtlesim_node

Here is what's wrong:

[ERROR] [1352578402.235275857]: [registerPublisher] Failed to contact master at [localhost:11311].  Retrying...

It looks like the ROS_MASTER_URI has been updated unexpectedly! The main problem now is i don't know how to set it back to default.

Most of you have completed the tutorials and some of you must have stuck on this. So, please share with me how you tackle the problem! I really appreciate that.

Sorry. It's the first time i posted something on ROS and I couldn't find a 'comment' button here.

I got the same trouble with launching gazebo for the first time after installing. Now, the Error '[50] tries' and 'no namespace' happened everytime i launch anything gazebo- derived. Any help?