Use of uninitialized value in numeric comparison (<=>) at Permanent.pl line 54, <DATA> line 164.


  my @sorted_files =
      map  { $_->[0] }  # Error message applies here (line 54)
	sort { $a->[1] <=> $b->[1] or $a->[2] <=> $b->[2] }
	  map  { [ $_, [stat]->[10], [stat]->[9] ] }  
	    @files;