DBD::CSV::db do failed: Can't use an undefined value as an ARRAY reference at /usr/lib/perl5/site_perl/5.10/SQL/Statement.pm line 1777, <GEN2> line 2.
 [for Statement "update bug set b = 1 + 1"] at /cygdrive/c/Users/Profesional/perl/databases/bug.pl line 9.
DBD::CSV::db do failed: Can't use an undefined value as an ARRAY reference at /usr/lib/perl5/site_perl/5.10/SQL/Statement.pm line 1777, <GEN3> line 2.
 [for Statement "update bug set b = 1 - 1"] at /cygdrive/c/Users/Profesional/perl/databases/bug.pl line 10.
DBD::CSV::db do failed: Can't use an undefined value as an ARRAY reference at /usr/lib/perl5/site_perl/5.10/SQL/Statement.pm line 1777, <GEN4> line 2.
 [for Statement "update bug set b = 1 * 1"] at /cygdrive/c/Users/Profesional/perl/databases/bug.pl line 11.
DBD::CSV::db do failed: Can't use an undefined value as an ARRAY reference at /usr/lib/perl5/site_perl/5.10/SQL/Statement.pm line 1777, <GEN5> line 2.
 [for Statement "update bug set b = 1 / 1"] at /cygdrive/c/Users/Profesional/perl/databases/bug.pl line 12.