this?
(exit) an exception was raised:
** (FunctionClauseError) no function clause matching in Arc.File.new/1
(arc) lib/arc/file.ex:16: Arc.File.new(%{file_name: “PICTURETEST.png”, updated_at: ~N[2018-10-24 16:15:58]})
(arc) lib/arc/actions/store.ex:9: Arc.Actions.Store.store/2
(userteam1) lib/userteam1_web/controllers/challenge_group_controller.ex:59: Userteam1Web.ChallengeGroupController.delete/2
(userteam1) lib/userteam1_web/controllers/challenge_group_controller.ex:1: Userteam1Web.ChallengeGroupController.action/2
(userteam1) lib/userteam1_web/controllers/challenge_group_controller.ex:1: Userteam1Web.ChallengeGroupController.phoenix_controller_pipeline/2
(userteam1) lib/userteam1_web/endpoint.ex:1: Userteam1Web.Endpoint.instrument/4
(phoenix) lib/phoenix/router.ex:278: Phoenix.Router.call/1
(userteam1) lib/userteam1_web/endpoint.ex:1: Userteam1Web.Endpoint.plug_builder_call/2
(userteam1) lib/plug/debugger.ex:122: Userteam1Web.Endpoint.“call (overridable 3)”/2
(userteam1) lib/userteam1_web/endpoint.ex:1: Userteam1Web.Endpoint.call/2
(plug) lib/plug/adapters/cowboy/handler.ex:16: Plug.Adapters.Cowboy.Handler.upgrade/4
(cowboy) /home/holo/Projects/userteamroleapi/deps/cowboy/src/cowboy_protocol.erl:442: :cowboy_protocol.execute/4
