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First try to unlink / rm the src/CMakeLists.txt in your workspace.

Then try building your workspace again (just run catkin_make in /home/user/projects/catkin_ws). That should work, provided you did not actually edit the file in /opt/ros/indigo/.. (that would have required sudo, so you should know / remember that).

If you did change toplevel.cmake itself, then you can just re-install the ros-$DISTRO-catkin package using apt-get:

sudo apt-get install --reinstall ros-indigo-catkin

That should replace the edited file with the original version. Building your workspace should now work again.

First try to unlink / rm the src/CMakeLists.txt in your workspace.

Then try building your workspace again (just run catkin_make in /home/user/projects/catkin_ws). That should work, provided you did not actually edit the file in /opt/ros/indigo/.. (that would have required sudo, so you should know / remember that).

If you did change toplevel.cmake itself, then you can just re-install the ros-$DISTRO-catkin package using apt-get:

sudo apt-get install --reinstall ros-indigo-catkin

for Indigo.

That should replace the edited file with the original version. Building your workspace should now work again.