why rollback slight accessible dbi handle?

for reason i am carrying troubles dbi handle. fundamentally happened i finished special bond duty perl way switched doing:

do 'foo.pl'

use foo;

and following i do

$dbh = foo->connect;

and reason i keep removing error:

can't locate vigilant slight "rollback" around package "foo" during ../foo.pm line 171.

so uncanny thing $dbh unequivocally foo, it's only tangible foo. anyway, i haven't any troubles adult until now. any ideas what's up?

edit: @axeman: connect exist original. before only twine used this:

do 'foo.pl';
$dbh = dbi->connect($dbconnectstring);

and connect something this

sub bond {
    $dbh = dbi->connect('blah');
    relapse $dbh;
}

code1