MATSim Version Compatibility Problems in GTFSConverter

[reckerh]

When using the GTFSConverter from GTFS2MATSim with MATSim 15.0-SNAPSHOT to create a PT network in MATSim (as in https://github.com/reckerh/matsim-stuttgart/blob/master/src/main/java/org/matsim/stuttgart/prepare/CreatePt.java), the following error appears:

Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface org.matsim.utils.objectattributes.attributable.Attributes, but class was expected
    at org.matsim.contrib.gtfs.GtfsConverter.convert(GtfsConverter.java:105)
    at org.matsim.stuttgart.prepare.CreatePt.create(CreatePt.java:65)
    at org.matsim.stuttgart.prepare.CreatePt.main(CreatePt.java:50)

The problem does not appear when working with MATSim 14.0.
I suspect that this is a compatibility issue that might be resolved by switching the GTFS2MATSim library to MATSim 15.0.