ok, so here is the reason for the issue:
Since you made the recording external to eclipse, when Chronon tries to open it, it doesnt see a build path, which is usually assigned by a 'launch configuration' when you record from within eclipse.
So seeing no build path, Chronon doesnt have a choice but to fall back to the 'search' method of looking for the file. Maybe if you closed the top most project 'nlt', which is not a true java project and just contains the other projects, the search api will be able to select an actual compilation unit by looking at a 'Java Project' instead of just a 'Project'.

Note that we will have provide some gui so that you can choose the 'source lookup path' for an external recording in a future update.