Foreign key constraint cannot add

Question

SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint (SQL: alter table products add constraint products_brand_id_foreign foreign key (brand_id) references product_brands (id) on delete cascade)

This is my brands migration

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateProductBrandsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('product_brands', function (Blueprint $table) {
            $table->id();
            $table->string('brand_name');
            $table->string('brand_status');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('product_brands');
    }
}

and this is my products migration

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateProductsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('products', function (Blueprint $table) {
            $table->id();
            $table->string('product_name');
            $table->string('sku');
            $table->string('product_unit_price');
            $table->string('quantity');
            $table->string('product_image');
            $table->string('product_description');
            $table->integer('brand_id')->unsigned();
            $table->integer('category_id')->unsigned();
            $table->integer('unit_id')->unsigned();
            $table->string('vat_type');
            $table->timestamps();
        });

        Schema::table('products', function (Blueprint $table) {
            $table->foreign('brand_id')->references('id')->on('product_brands')->onDelete('cascade');
            $table->foreign('category_id')->references('id')->on('product_categories')->onDelete('cascade');
            $table->foreign('unit_id')->references('id')->on('units')->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('products');
    }
}