Use of uninitialized value $b in string comparison (cmp) at /home/lanx/B/PL/PM/ScopeListUtils.pl line 9. Use of uninitialized value $a in string comparison (cmp) at /home/lanx/B/PL/PM/ScopeListUtils.pl line 9. Use of uninitialized value $b in string comparison (cmp) at /home/lanx/B/PL/PM/ScopeListUtils.pl line 9. Use of uninitialized value $a in string comparison (cmp) at /home/lanx/B/PL/PM/ScopeListUtils.pl line 9. ...