Laravel migration self referencing foreign key issue

Laravel migration self referencing foreign key issue

Hi I have a problem to create a table using migration schema builder. The
problem occure with table with self referencing foreign key. Here is the
code which produce error:
Schema::create('cb_category', function($table)
{
$table->integer('id')->primary()->unique()->unsigned();
$table->integer('domain_id')->unsigned();
$table->foreign('domain_id')->references('id')->on('cb_domain');
$table->integer('parent_id')->nullable();
$table->foreign('parent_id')->references('id')->on('cb_category')->onUpdate('cascade')->onDelete('cascade');
$table->string('name');
$table->integer('level');
});
Here is the error:
SQLSTATE[HY000]: General error: 1005 Can't create table
'eklik2.#sql-7d4_e' (errno: 150) (SQL: alter table `cb_cate
goryadd constraint cb_category_parent_id_foreign foreign key (parent_id)
referencescb_category(id`) on del ete cascade on update cascade)
(Bindings: array ( ))
[PDOException] SQLSTATE[HY000]: General error: 1005 Can't create table
'eklik2.#sql-7d4_e' (errno: 150)
Any idea?