[Vala] error with arraylist and class

[Pavol Klačanský <pavol klacansky com>]

Hi, this line reports me error

"Feed" is class

"public Gee.ArrayList<Feed?> get_all_feeds() {"

this error

server.vala:44.9-44.28: error: GVariant serialization of type
`Gee.ArrayList<Feed?>' is not supported
        public Gee.ArrayList<Feed?> get_all_feeds() {


Thanks for reply

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