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Try:

In one terminal run "roscore" Then, in a new terminal do "rosrun rviz rviz"

Try:

In one terminal run "roscore" ~~Then,~~ After, in a new terminal do "rosrun rviz rviz"

Try:

In one terminal run "roscore" ~~After,~~ Then, in a new terminal do "rosrun rviz rviz"

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