[phenixbb] Unable to open phenix.refine

Has anyone had problems trying to open phenix.refine? I have installed Phenix 2.0.5936 several times but keep on getting the following error message when I click on phenix.refine: KeyError : 'Unrecognized input file parameter refinement.gui.migration.refinement.input.sequence.file_name (allowed: data_manager.model.file, refinement.reference_model.file, refinement.gui.migration.refinement.input.pdb.file_name, refinement.gui.migration.refinement.input.pdb.neutron_file_name, refinement.gui.migration.refinement.input.pdb.electron_file_name, refinement.den.reference_file).' Any help/advice would be much appreciated. Thanks in anticipation!