Hi,

Hope this is what you requested?

   17      my $ref = $db->fetch_assoc($sth);

   495        while ( my $ref = $self->fetch_assoc($sth) ) {
   550        my $ref = $self->fetchOne('SELECT sql FROM sqlite_master
+ WHERE tbl_name = ?', $src_table);
   661    selectOne($q) is a shortcut to prepare and execute a structu
+re select, and fetch the first row
   668        $self->select(@q)->fetchrow_hashref;
   740        while ( my @arr = $sth->fetchrow_array() ) {
   802        while ( my $ref = $self->fetch_assoc($sth) ) {
   840        my $ref = $self->fetchOne($self->_count_sql($table, $whe
+re));
   856    =item fetchOne
   858    fetchOne($q) is a shortcut to prepare and execute a query, a
+nd fetch the first row
   862    sub fetchOne {
   864        $self->query(@q)->fetchrow_hashref;
   867    =item fetch_assoc
   873    sub fetch_assoc {
   877        my $row = $sth->fetchrow_hashref;
   879            $self->die("fetching row failed ".$sth->err);
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As you can see from line 802

while ( my $ref = $self->fetch_assoc($sth) )
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the method fetch_assoc() expects a statement handler. The usual way to do it would be:

my $dbh = DBI->connect(@db_args);
my $sql = "SELECT email FROM database.table";
my $sth = $dbh->prepare($sql);
$sth->execute();
while (my $hashref = $sth->fetchrow_hashref) {
    ...
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But obviously your module is intervening, so you need to find how to acquire the statement handler $sth from the module - possibly:

my $sth = $db->query($sql)...
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Also you need to work out what type of data structure fetch_assoc() is returning - I don't think it's returning an array (@row) as you expect in your code, more likely a hash reference, use Data::Dumper to find out.