Phoenix_live_view: Upload Example isn't working: no function clause matching in Phoenix.LiveView.UploadChannel.handle_in/3

[RobertSwirsky]

I've taken the code exactly as indicated in the phoenix live view upload guide as seen here:

https://github.com/phoenixframework/phoenix_live_view/blob/b87e5f829168911bb43d5bce6eb75847ed9e3bbd/guides/server/uploads.md

I'm running this on commit 0661fcc33141a2648247426a8094fbba1dc72bb4 on master.

The code will die here:

** (FunctionClauseError) no function clause matching in Phoenix.LiveView.UploadChannel.handle_in/3
    (phoenix_live_view 0.15.0-dev) lib/phoenix_live_view/upload_channel.ex:54: Phoenix.LiveView.UploadChannel.handle_in("chunk", %{}, %Phoenix.Socket{assigns: %{chunk_timeout: 10000, chunk_timer: nil, done?: false, handle: #PID<0.552.0>, live_view_pid: #PID<0.546.0>, max_file_size: 783604, path: "C:\\Users\\rober\\AppData\\Local\\Temp/plug-1605/live_view_upload-1605815977-654831136887540-4", uploaded_size: 0}, channel: Phoenix.LiveView.UploadChannel, channel_pid: #PID<0.551.0>, endpoint: TzipperWeb.Endpoint, handler: Phoenix.LiveView.Socket, id: nil, join_ref: "9", joined: true, private: %{connect_info: %{session: %{"_csrf_token" => "hhLVz_h9pQZ1krJ2GKYaCIyh", "phauxth_session_id" => 82}}, log_handle_in: false, log_join: :info}, pubsub_server: Tzipper.PubSub, ref: "10", serializer: Phoenix.Socket.V2.JSONSerializer, topic: "lvu:0", transport: :websocket, transport_pid: #PID<0.543.0>})

Last message: %Phoenix.Socket.Message{event: "chunk", join_ref: "9", payload: %{}, ref: "10", topic: "lvu:0"}

It looks like the second parameter is wrong. It's expecting a map with the key :binary at the beginning and the empty parameter that somehow gets there is causing the no function clause matching error. I've been trying to figure out why this is happening. I have a validate handler.

[chrismccord]

You aren't running phoenix 1.5.7, which contains the binary serialization support. Thanks!

[RobertSwirsky]

Thank you Chris! I've been pulling out my hair over this for the past couple of days.