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This is a question that comes up quite often. Please do a thorough search before asking next time, or at least let us know that you've tried solutions in answers that you found and the results.

Please see the highly upvoted answer for this question #q143496

This is a question that comes up quite often. Please do a thorough search before asking next time, or at least let us know that you've tried solutions in answers that you found and the results.results. You should try searching the error on Google using the following format:

<error> site:answers.ros.org

or for this problem specifically

[turtlebot3_world.launch] is neither a launch file in package [turtlebot3_gazebo] nor is [turtlebot3_gazebo] a launch file name site:answers.ros.org

Please see the highly upvoted answer for this question #q143496