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I have just solved the problem. In the new window, Firstly i set 'export DISPLAY=:0' and then i set 'rviz' (Before I have run the program Xlauch).

I have just solved the problem. I need that the server run in one window (first run 'export DISPLAY=:0' to set it, and then run the server with 'roscore). So we need to open a new window (the client), In the new window, Firstly one hand, in this window i set 'export DISPLAY=:0' the Display ('export DISPLAY=:1'). In other hand, I run the graph enviroment (run Xlaunch and set window 1, for the Rviz (client)). So in the client window, i can run Rviz with the command 'rviz', and then i set 'rviz' (Before I have run the program Xlauch).will open.