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I've found that the reason for this is that, once you source a directory in .bashrc, when colcon build-ing a directory, it also saves the sourced package paths in its setup.bash, meaning that, when you move a sourced directory, you have to rebuild all the other packages to not get this message. So, as @LucB already said, deleting the log, install, build and rebuilding is the solution. In my case, I was moving multiple workspaces to a different folder so I was getting a bunch of these from each of the workspaces.