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rqt_plot not found

Following the ROS tutorial, when I'm trying to plot the position of the turtle, I get the following error:

$ rosrun rqt_plot rqt_plot --args /turtle1/pos/x:y
[rosrun] Couldn't find executable named rqt_plot below /opt/ros/fuerte/stacks/rqt/rqt_plot
[rosrun] Found the following, but they're either not files, 
[rosrun] or not executable:
[rosrun]   /opt/ros/fuerte/stacks/rqt/rqt_plot
[rosrun]   /opt/ros/fuerte/stacks/rqt/rqt_plot/src/rqt_plot

Any ideas why this might be happening? By the way, rqt_gui works fine.

rqt_plot not found

Following the ROS tutorial, when I'm trying to plot the position of the turtle, I get the following error:

$ rosrun rqt_plot rqt_plot --args /turtle1/pos/x:y
/turtle1/pose/x:y
[rosrun] Couldn't find executable named rqt_plot below /opt/ros/fuerte/stacks/rqt/rqt_plot
[rosrun] Found the following, but they're either not files, 
[rosrun] or not executable:
[rosrun]   /opt/ros/fuerte/stacks/rqt/rqt_plot
[rosrun]   /opt/ros/fuerte/stacks/rqt/rqt_plot/src/rqt_plot

Any ideas why this might be happening? By the way, rqt_gui works fine.