symfony4 - symfony 4.4 + FOSCKEditor + helios-agElfinder 不工作

Question

在 composer install 之后使用 Symfony 4.4 + "friendsofsymfony/ckeditor-bundle": "^2.2" + "helios-ag/fm-elfinder-bundle": "dev-master" （但也尝试了 composer require helios-ag/fm-elfinder -来自文档页面的捆绑包）给了我

Executing script cache:clear [KO]
 [KO]
Script cache:clear returned with error code 1
!!  
!!  In RegisterControllerArgumentLocatorsPass.php line 173:
!!                                                                                 
!!    Cannot determine controller argument for "FM\ElfinderBundle\Controller\ElFi  
!!    nderController::load()": the $eventDispatcher argument is type-hinted with   
!!    the non-existent class or interface: "Psr\EventDispatcher\EventDispatcherIn  
!!    terface".                                                                    
!!                                                                                 
!!  
!!  
Script @auto-scripts was called via post-install-cmd

路由已导入，配置文件设置...

顺便说一句：在 fm_elfinder.yml 中无法识别 include_assets（已将其注释掉）

我完全不知道。你们中的任何人都可以给我一个线索吗？谢谢。

附言。与 symf 一起工作得很好。4.1