(@fer) = find_all_categories();
sub find_all_categories {
 $id = shift;
 if($id) {
  $sthm = $dbh->prepare_cached("SELECT * FROM category WHERE id=?");
  $sthm->execute($id) or die $dbh->errstr;
 } else {
  $sthm = $dbh->prepare("SELECT * FROM category");
  $sthm->execute or die $dbh->errstr;
 }
 while (@hi = $sthm->fetchrow_array) {

 if($hi[2] eq "0") {
   push(@env, @hi[0])
 } else {
   $a = find_all_categories($slog[0]);
   $i += $hi[3];
   $i + $a;
 }

 }
 push(@env,$i);
 return(@env);
}
[download]

Yea im getting this little error

Can't call method "prepare" on an undefined value at cart.pm line 1612.