Symfony 5 : Could not find configuration for a filter in liip / LiipImagineBundle

I want to user liip/LiipImagineBundle for vich/uploader-bundle as per documents. I installed packages and configured them in Symfony 5.

But showing error: Could not find configuration for a filter

Here is my composer.json:

    ..."doctrine/orm": "^2.7","liip/imagine-bundle": "^2.3","symfony/framework-bundle": "5.0.*","vich/uploader-bundle": "^1.15"    ...

Config file: config/packages/liip_imagine.yaml

liip_imagine:    # valid drivers options include "gd" or "gmagick" or "imagick"    driver: gd    resolvers:        default:            web_path:                web_root: '%kernel.project_dir%/public/uploads/products'                cache_prefix: imagine/cache    filter_sets:        filters:            cache: ~        avatar:            quality: 75            cache: ~            filters:                thumbnail:                    size:                        - 120                        - 120                    mode: outbound            post_processors: {  }    loaders:        default:            filesystem:                locator: filesystem                data_root:                    - '%kernel.project_dir%/public/uploads/products'                allow_unresolvable_data_roots: false                bundle_resources:                    enabled: false                    access_control_type: blacklist                    access_control_list: {  }    cache: default    cache_base_path: ''    data_loader: default    default_image: null    default_filter_set_settings:        quality: 100        jpeg_quality: null        png_compression_level: null        png_compression_filter: null        format: null        animated: false        cache: null        data_loader: null        default_image: null        filters: {  }        post_processors: {  }    controller:        filter_action: 'Liip\ImagineBundle\Controller\ImagineController::filterAction'        filter_runtime_action: 'Liip\ImagineBundle\Controller\ImagineController::filterRuntimeAction'        redirect_response_code: 301    enqueue: false    templating: true

and route file : config/routes/liip_imagine.yaml

_liip_imagine:resource:"@LiipImagineBundle/Resources/config/routing.yaml"

ERROR: "Could not find configuration for a filter"

how do I solve this?