Dear Bernd,
Thank you for your responses to my earlier posts! I am trying to run the quick test that you posted in your github:
source ~/tagslam_root/devel/setup.bash
roslaunch tagslam tagslam.launch bag:=`rospack find tagslam`/example/example.bag
and I get the following error:
How do I fix this? Also sorry if this is a duplicate post or a post that could have been solved on by googling, though I didn't see any solutions.