laravel 5 migration error when run newly created mirgration file

i just have created a new migration file, to insert a new column to existing table.

the file code is:

<?php

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

class AddStatusToPhoto extends Migration {

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('photos', function(Blueprint $table)
        {
            $table->integer('status');
        });

    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        //
    }


}

but when i run php artisan migrate, there is an error message:

  [Illuminate\Database\QueryException]
  SQLSTATE[42S01]: Base table or view already exists: 1050 Table 'permission_
  role' already exists (SQL: create table `permission_role` (`id` int unsigne
  d not null auto_increment primary key, `permission_id` int unsigned not nul
  l, `role_id` int unsigned not null, `created_at` timestamp default 0 not nu
  ll, `updated_at` timestamp default 0 not null) default character set utf8 c
  ollate utf8_unicode_ci)

anyone know what is the problem?

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