h5format_convert error: unable to downgrade dataset "/DSET_ERR"
H5tools-DIAG: Error detected in HDF5:tools (version (number)) thread (IDs):
  #000: (file name) line (number) in h5trav_visit(): traverse failed
    major: Failure in tools library
    minor: error in function
  #001: (file name) line (number) in traverse(): H5Lvisit_by_name failed
    major: Failure in tools library
    minor: error in function
