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The error you are getting is referring to this line:
<node pkg="ORB_SLAM" type="ORB_SLAM" name="ORB_SLAM" args="Data/ORBvoc.yml Data/Settings.yaml" cwd="node" output="screen">
This means that roslaunch cannot find the executable file ORB_SLAM anywhere in the ORB_SLAM package. Now, it's not clear to me why that's the case, but a common issue is that users do not source the setup.bash file after building which allows tools like roslaunch to find things like this. So presumably you built the workspace containing ORB_SLAM and that would have generated this setup.bash file somewhere. But without more information on how you built or installed this package you want to use, it's hard to help you further.
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