我用的是拉威尔，当我想跑的时候 php artisan make:migrate 显示此错误：
illuminate\database\queryexception:sqlstate[42000]：语法错误或访问冲突：1071指定的键太长；最大密钥长度为767字节（sql:alter table users 添加唯一的 users_email_unique ( email ))
at/users/soksan/desktop/testlaravel/multiusers/vendor/laravel/framework/src/illuminate/database/connection。php:664

660|    // If an exception occurs when attempting to run a query, we'll format the error
  661|    // message to include the bindings with SQL, which will make this exception a
  662|    // lot more helpful to the developer instead of just the database's errors.
  663|    catch (Exception $e) {
> 664|        throw new QueryException(
  665|            $query, $this->prepareBindings($bindings), $e
  666|        );
  667|    }
  668|

异常跟踪：
1 PDOException::("SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 767 bytes") /users/soksan/desktop/testlaravel/multiusers/vendor/laravel/framework/src/illuminate/database/connection。php:458
2 PDOStatement::execute() /users/soksan/desktop/testlaravel/multiusers/vendor/laravel/framework/src/illuminate/database/connection。php:458
请用这个论点 -v 查看更多详细信息。