Laravel 5.4: SQLSTATE[HY000]: General error: 1005 Can't create table "Foreign key constraint is incorrectly formed"

I'm using Laravel 5.4 and I have added this Migration:

public function up()
    {
        Schema::create('episodes', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('course_id')->unsigned();
            $table->foreign('course_id')->references('id')->on('courses')->onDelete('cascade');
            $table->string('type', 10);
            $table->string('title');
            $table->string('slug');
            $table->text('description');
            $table->text('body');
            $table->string('videoUrl');
            $table->string('tags');
            $table->string('time', 15)->default('00:00:00');
            $table->integer('number');
            $table->integer('viewCount')->default(0);
            $table->integer('commentCount')->default(0);
            $table->integer('downloadCount')->default(0);
            $table->timestamps();
        });
    }

Now when I run php artisan migrate, I get this error:

SQLSTATE[HY000]: General error: 1005 Can't create table elearning.episodes (errno: 150 "Foreign key constraint is incorrectly formed") (SQL: alter table episodes add constraint episodes_course_id_foreign foreign key (course_id) references courses (id) on delete cascade)

I also tried this but still gets the same error:

$table->unsignedBigInteger('course_id');

So how can I properly run this Migration? I'm really stuck with this, please help me out...

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