How do I solve "Inconsistent input arguments: expected class 'coder.Type', found 'struct'"

Hi, I am trying to migrate from 2014a to 2015b but get some problem when using codegen. In my build.m I call codegen like this

        codegen  -config cfg ...
              -launchreport ...
              -globals G ...
              MyIncludes\my_fusionTracker_types.h ...
              MyIncludes\radarBarrierTypes.h ...
              MyIncludes\CADS4_typesShared.h ...
              MyIncludes\tracker_utilities.h ...
              fusionTracker.m -args {fusDetails, fusTrk, fusTrkPred, hostProps, vehState, dets, tlet, tletProps, visObs, visProps, visSys, visSysProps, visFailsafes, roadInfo, Calib, Guardrails} ...
              guardrailTracker.m -args {dets, tlet, tletProps, vehState, Guardrails, logData, internal_guard }

and I get the following error:

240         codegen  -config cfg ...
Inconsistent input arguments: expected class 'coder.Type', found 'struct'

This worked fine in 2014a but not in 2015b so what is the trick?

/Charles