Error install Elfinder for ckeditor for Symfony 4.3 [closed]

  ckeditor, elfinder, php, symfony

Good evening, I currently have a problem with the installation of elfinder for ckeditor on symfony 4.3
During installation everything is fine but when adding the bundle in the file bundle.php when reloading the page it shows me

Attempted to load class “FMElfinderBundle” from namespace “FMElfinderBundle”. Did you forget a “use” statement for another namespace?

I don’t understand where it could come from.
thank you in advance

Source: Symfony Questions