anchor.diff:    close(udata)
   
     ! open output
  -
     call units_open(trim(mode)//'.log','unknown',ulog,err)
     if(err /= 0) then
        if (iproc == 0) write(0,*) "error opening file ", trim(mode)//'.log'
  
positive.code:        nvars,nclasses,nseqs,neff,seqs,err,err_string)
  
    if (err /= 0) then
       call mpi_wrapper_finalize(err)
       stop
    end if
  
negative.code:   if (urst > 0) then
       call read_rst(urst,data_format,nvars,nclasses,iproc,nproc,seq,prm,err)
       if (err /= 0) then
          if(iproc == 0) write(0,*) 'ERROR ! cannot read from rst'
          call mpi_wrapper_finalize(err)
          stop
       end if
  