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TurtleSim [rosrun turtlesim turtlesim_node] doesn't work

I'm new to ROS and I'm trying to progress with the tutorial. Currently running Fuerte on Oneiric.

I was trying rosrun turtlesim turtlesim_node

and it gave me this:

(turtlesim_node:2972): Gtk-WARNING *: Unable to locate theme engine in module_path: "pixmap", (turtlesim_node:2972): Gtk-WARNING *: Unable to locate theme engine in module_path: "pixmap", (turtlesim_node:2972): Gtk-WARNING *: Unable to locate theme engine in module_path: "pixmap", (turtlesim_node:2972): Gtk-WARNING *: Unable to locate theme engine in module_path: "pixmap", and a blue screen with nothing in it. This is what it meant to be: http://www.ros.org/wiki/ROS/Tutorials/UnderstandingNodes

I did run a core and make Turtlesim before running and I don't really know what's going on... Thanks in advance.

P.S. I was reading other posts and some claimed that there is a problem with the tutorials. But those posts were about 2 to 3 yrs old...