I run the beginner_turtle package. First, I run the command roscore. It seems all right. But when running the talker and listener, the screen displays Failed to contact the master at robot_name: 11311. How to deal with it? Thank you. -- View this message in context: http://ros-users.122217.n3.nabble.com/Failed-to-contact-the-master-at-robot-name-11311-tp943764p943764.html Sent from the ROS-Users mailing list archive at Nabble.com. ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ ros-users mailing list ros-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ros-users