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Have you done a source /opt/ros/melodic/setup.bash?

This must be done every time you open a command line window if you do not add it to your .bashrc.

Have you done a source /opt/ros/melodic/setup.bash?

? This must be done every time you open a command line window if you do not add it to your .bashrc.

Update: if you put qt_creator into the search box at the top of this page, you will get a lot of hits. #q336242 in particular looks helpful for your problem, but that answer assumes you will use catkin build, not catkin_make.

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