[phenixbb] reference model restraints by segid

Hi,I am having trouble getting phenix to used segid's in reference model restraints when my reference and target pdbs both don't use chain ID's.phenix quits with this message: *** Adding Reference Model Restraints *** Sorry: chain ' ' in /home/path/removed/agnref2.pdb contains one or more errant TER cards. Please remove and try again. my definition file looks like this:refinement {    main {      reference_model_restraints = True    }    reference_model {      file = two.pdb    } }   refinement.reference_model.reference_group {  reference = segid A16S  selection = segid A16S } (above about 50 more times) this was on versions 1.9-1692 , dev-2016 and dev-2056 any suggestions ?thanksjpd