Referencing column 'user_id' and referenced column 'id' in foreign key constraint 'products_user_id_foreign' are incompatible. code example

Example: General error: 3780 Referencing column 'user_id' and referenced column 'id' in foreign key constraint 'blog_posts_user_id_foreign' are incompatible.

$table->bigInteger('user_id')->unsigned()->index();
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');