Once again, everything works, but each call to the above line returns that error.

Here's the code I use to retrieve each record....

$data = readRaw(table name);

sub readRaw {
    my ($rawfilename) = @_;

    my $dbCommand = 'select '.join ',', @rawFields;
    $dbCommand .= qq^ from $rawfilename;^;

    $dbHandle=$db->prepare($dbCommand);
    $dbHandle->execute();

    my $data = $dbHandle->fetchall_arrayref();
    $dbHandle->finish;

    foreach my $rows (@$data) {
            my %GenericData;
            @GenericData{ @rawFields } = @$rows; # NOTE added

            push @rawRecords, \%GenericData;
        }

     return \@rawRecords;
}
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So I have an array of arrays, but each array holds the reference to a hash for each record read

And $data is passed to this function

sub makeJSONToExport {
    my ($arrayref) = @_;

    my $typehint_raw =  { age        => JSON_TYPE_INT,
            lastname      => JSON_TYPE_STRING,
            firstname          => JSON_TYPE_STRING};


    my $typehint_raws = [ ($typehint_raw) x  @$arrayref];
    my $json = encode_json($arrayref, $typehint_raws);
    return $json;
}
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