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Without any further information or poitners to the source of that package it is hard to tell what is going on. Does the file tb_tables.launch actually exist? Did you source the setup.bash file?

What does rospack find tb_tables output?

If that gives an error, try executing source /home/gabriel/catkin_ws/devel/setup.bash and then try the roslaunch again.

Be sure to checkout the catkin tutorials, in particular this one, in order to know how to work with catkin and workspaces: http://wiki.ros.org/catkin/Tutorials/using_a_workspace