ClassNotFoundException on convert

I installed version 2.0.4 and every time I call method convert I get following exception:

Attempted to load class "MetadataFactory" from namespace "Metadata".
Did you forget a "use" statement for another namespace?

In version 2.0.3 it worked.

While debugging I noticed that in your service.yml you refer to classes (FileCache, MetadataFactory), which do not exist in your code:

 snowcap_im.metadata.cache:
        class: Metadata\Cache\FileCache
        public: false
        arguments:
            - {}

    snowcap_im.metadata.mogrify_factory:
        class: Metadata\MetadataFactory
        public: false
        arguments: [@snowcap_im.metadata.mogrify_driver]
        calls:
            - [setCache, ["@snowcap_im.metadata.cache"]]

[Halfi]

same problem, but exception called everywhere. Im downgrade to 2.0.3 version and have no problem.

[hs2323]

They are missing the Metadata library library in the composer file (https://github.com/schmittjoh/metadata/).