[turtlemimic.launch] is neither a launch file in package [test_launch] nor is [test_launch] a launch file name?

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I came up with the same problem. Here is my first solution without checking this website. My error note is just the same as yours

[tutrtlemimic.launch] is neither a launch file in package [beginner_tutorials] nor is [beginner_tutorials] a launch file name
The traceback for the exception was written to the log file

so I try to edit the command, first you need go to the ~/catkin_ws/src/beginner_tutorials/launch and then type the commandroslaunch turtlemimic.launch . It works to me.

But I think what I'm missing should be source devel/setup.bash,after I go through this website. I tried it and execute the ~/catkin_ws$ roslaunch beginner_tutorials turtlemimic.launch

It works, I think we need to do source every time we made some new file or folder. Before we use roslaunch or other command.

Is there a space between the package name in your package.xml? I was having the same error in a different package and removing spaces inside <name></name> solved the problem for me.

Please see this issue for a possible cause of your problem.

This error is directly related to the content inside the launch file you created. Just make sure that all necessary hashes and brackets are included as in paragraph 2.3 under this website http://wiki.ros.org/ROS/Tutorials/Usi....

Also make sure when you create the file, that you have only one set of numbers on the left column. Because if you copy whats inside this paragraph on a new file, that has numbers directly embedded inside of it, creates an error in format.