Checking for PDO commit

Question

I need to send a successful save only when COMMIT runs without.

the problem is in return ajax, no done.

in my HTML when an error occurs, it returns the catch error and commit ok

I need to print the OK only if the file is successfully included without any error, so I saw it exists the commit but it was not executed because my return is like this.

"Error: SQLSTATE[HY093]: Invalid Parameter number: number of bound variables does not match number of tokens""ok"

this message does not even enter the ajax DONE. This is the problem, so no msg appears for the user, the message is only in the console.log.

my ajax.

function sub(arquivo, acao) {
    $("#load").show();
    var Self = this;

    if (Self.working) {
        return;
    }
    Self.working = true;

    var formData = new FormData($("#form")[0]);
    formData.append("acao", acao);
    formData.append("arquivo", arquivo);

    jQuery.ajax({
        type: 'POST',
        mimeType: "multipart/form-data",
        url: 'model/acao/controller.php',
        dataType: 'json',
        data: formData,
        contentType: false,
        processData: false
    }).done(function (html) {
        if (html == "ok") {
            if (acao == 'Incluir') {
                alert("Salvo com sucesso");
            }
            if (acao == 'Alterar') {
                alert("Alterado com Sucesso");
            }
        } else {

            alert(html);
        }
    }).complete(function () {
        Self.working = false;
        $("#load").hide();
    });

}

my commit

   public function commit() {
            if (DB::getInstance()->commit()) {
                print json_encode("ok");
            }
        }

my crud file is with include so.

public function insert($table, array $dados, $bool = true) {
        try {
            if ($bool == true) {

                $this->beginTransaction();
            }
            $sql = "INSERT INTO $table ({$this->colunas($table)->select}) VALUES ({$this->colunas($table)->indiceInsert})";
            $stmt = DB::prepare($sql);
            foreach ($dados as $key => $v) {
                $stmt->bindValue(':' . $key, $v);
            }
//            print'<pre>';
//            $stmt->debugDumpParams();
//            print'</pre>';
            if ($stmt->execute()) {
                $cd = DB::getInstance()->lastInsertId();
                return $cd;
            } else {
                echo json_encode("Erro ao Inserir!");
                return false;
            }
        } catch (PDOException $e) {
            echo json_encode('Error: ' . $e->getMessage());
        }
    }

My including

public function incluir() {
        $dados = $this->dados();
        $dados['dt_boletim'] = date("Y-m-d H:i:s");

        if (self::insert($this->table, $dados)) {
            self::commit();
            return true;
        }
    }