مشکل در کد php artisan migrate

Migration table created successfully.
Migrating: 2014_10_12_000000_create_users_table

   Illuminate\Database\QueryException

  SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 767 bytes (SQL: alter table `users` add unique `users_email_unique`(`email`))

  at C:\Users\arman_000\Desktop\lrvl\vendor\laravel\framework\src\Illuminate\Database\Connection.php:692
    688▕         // If an exception occurs when attempting to run a query, we'll format the error
    689▕         // message to include the bindings with SQL, which will make this exception a
    690▕         // lot more helpful to the developer instead of just the database's errors.
    691▕         catch (Exception $e) {
  ➜ 692▕             throw new QueryException(
    693▕                 $query, $this->prepareBindings($bindings), $e
    694▕             );
    695▕         }
    696▕     }

    696▕     }

  1   C:\Users\arman_000\Desktop\lrvl\vendor\laravel\framework\src\Illuminate\Database\Connection.php:485
      PDOException::("SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 767 bytes")

  2   C:\Users\arman_000\Desktop\lrvl\vendor\laravel\framework\src\Illuminate\Database\Connection.php:485
      PDOStatement::execute()