When the ' character exists in one of the column titles, view names,… the DXL Importer cannot correctly import the DXL and the design changes fail. This has to do with the NotesDOMParser.Serialize() method that creates something like attribute='value with ' in it'. A future fix will try to replace this character or, if this doesn't work, try to remove it from the DXL before importing. In the meantime remove the ' manually before doing a redesign.