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I guess this problem has little value to learn, because my package is installed from turtlebot officially, which might be different from you all. Problem is simple: after I rxgraph, I found problems in nodes connection, and then I check the launch file, found errors in it. I corrected it and rosmake that package again.

I guess this problem has little value to learn, because my package is installed from turtlebot officially, which might be different from you all. Problem is simple: after I rxgraph, I found problems in nodes connection, and then I check the launch file, found errors in it. I corrected it and rosmake that package again.again. Or maybe I did something wrong to turtlebot_teleop package previous(I think this possibility is tiny).