GTFS editor, using PBABase , compile error regarding em() entity manager

Question

I am trying to run gtfs-editor.

I get compile errors for all the uses of em() for all the entity handling classes. I have a working gis db and I have got past a previous error of failing to connect, so I think I am in.

I have to say though if this is because it cant get hold of a db it's got a funny way of saying so. Is this a classic problem with other entity handlers if the user hasnt installed properly.

Here's the error message and line:

Error raised is : Cannot make a static reference to the non-static method em() from the type JPABase
/app/jobs/ProcessGtfsSnapshotMerge.java line 398

Trip.em().createNativeQuery("UPDATE trip SET pattern_id = ? WHERE id = ?").setParameter(1, patternId).setParameter(2,  tripId).executeUpdate();