I've created a migration for CreateUserTable successfully. <?php

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

class CreateUserTable extends Migration {

/**
 * Run the migrations.
 *
 * @return void
 */
public function up()
{
    Schema::create('user', function(Blueprint $table)
    {
        $table->increments('id');
        $table->string('email')->unique;
        $table->string('password', 60);
        $table->timestamps();
    });
}

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

}

but I'm not able to rollback:

$ php artisan migrate:rollback

{"error":{"type":"Symfony\Component\Debug\Exception\FatalErrorException","message":"Class 'CreateUserTable' not found","file":"C:\xampp\htdocs\laravel\vendor\laravel\framework\src\Illuminate\Database\Migrations\Migrator.php","line":301}}

Someone suggested to run below but it give me an other error:

$ composer dump-autoload

Composer could not find the config file: C:\ProgramData\ComposerSetup\bin To initialize a project, please create a composer.json file as described in the http://getcomposer.org/ "Getting Started" section

Any solution to rollback and avoid this second error related to composer.json? I'[m using Laravel 4 with fresh installation.