bash Error: No such file or directory

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Please provide the link to the tutorial you followed and a description of what you are trying to accomplish.

The error seems pretty explicit: the file you are trying to source doesn't exist Most likely you are trying to source a workspace that hasn't been built yet.

I wanted to create a workspace and create a package in ROS. I followed the tutorial https://www.youtube.com/watch?v=l5RDBuIM3U8&feature=youtu.be (2:22 -2:30)

As @marguedas said the error explicitly tells you that the file setup.bashsource doesn't exist, which is normal since the file should be setup.bash. I would guess that when executing the previous command of your tutorial echo source ~/catkin_ws/devel/setup.bash >> ~/.bashrc you might have wrongly typed something and appended source at the end of the file name. Check your .bashrc file to correct this typo.