Problem with exercise 4.3

I have a problem with this exercise because no matter what I do i can’t publish the Age message cause I get an error saying that theres no module names exercise_33 (the generic solution, copy-pasted it after my didn’t work to test), i tried a few solutions but none of them worked. What more can I do?

I forced removed the build and devel directiores (rm -rf /build /devel) then made another catkin_make and it worked like a charm