No function clause matching…

[info] POST /api/price
[debug] Processing with HomeworkWeb.PricesController.create/2
  Parameters: %{"_json" => [%{"amount" => 500, "category" => "Sell", "type" => "P"}]}
  Pipelines: [:api]
[info] Sent 400 in 10ms
[debug] ** (Phoenix.ActionClauseError) no function clause matching in HomeworkWeb.PricesController.create/2

The following arguments were given to HomeworkWeb.PricesController.create/2:

    # 1
    %Plug.Conn{adapter: {Plug.Cowboy.Conn, :...}, assigns: %{}, before_send: [#Function<0.23023616/1 in Plug.Telemetry.call/2>], body_params: %{"_json" => [%{"amount" => 500, "category" => "Sell", "type" => "P"}]}, cookies: %{}, halted: false, host: "localhost", method: "POST", owner: #PID<0.597.0>, params: %{"_json" => [%{"amount" => 500, "category" => "Sell", "type" => "P"}]}, path_info: ["api", "price"], path_params: %{}, port: 8000, private: %{HomeworkWeb.Router => {[], %{}}, :phoenix_action => :create, :phoenix_controller => HomeworkWeb.PricesController, :phoenix_endpoint => HomeworkWeb.Endpoint, :phoenix_format => "json", :phoenix_layout => {HomeworkWeb.LayoutView, :app}, :phoenix_request_logger => {"request_logger", "request_logger"}, :phoenix_router => HomeworkWeb.Router, :phoenix_view => HomeworkWeb.PricesView, :plug_session_fetch => #Function<1.77458138/1 in Plug.Session.fetch_session/1>}, query_params: %{}, query_string: "", remote_ip: {127, 0, 0, 1}, req_cookies: %{}, req_headers: [{"accept", "*/*"}, {"accept-encoding", "gzip, deflate, br"}, {"connection", "keep-alive"}, {"content-length", "65"}, {"content-type", "application/json"}, {"host", "localhost:8000"}, {"postman-token", "d5cef312-5fac-43bc-a72d-9330f308dc1b"}, {"user-agent", "PostmanRuntime/7.26.8"}], request_path: "/api/price", resp_body: nil, resp_cookies: %{}, resp_headers: [{"cache-control", "max-age=0, private, must-revalidate"}, {"x-request-id", "FuyjT6d9YEjJwpIAAADC"}], scheme: :http, script_name: [], secret_key_base: :..., state: :unset, status: nil}

    # 2
    %{"_json" => [%{"amount" => 500, "category" => "Sell", "type" => "P"}]}

    (homework 0.1.0) lib/homework_web/controllers/prices_controller.ex:14: HomeworkWeb.PricesController.create(%Plug.Conn{adapter: {Plug.Cowboy.Conn, :...}, assigns: %{}, before_send: [#Function<0.23023616/1 in Plug.Telemetry.call/2>], body_params: %{"_json" => [%{"amount" => 500, "category" => "Sell", "type" => "P"}]}, cookies: %{}, halted: false, host: "localhost", method: "POST", owner: #PID<0.597.0>, params: %{"_json" => [%{"amount" => 500, "category" => "Sell", "type" => "P"}]}, path_info: ["api", "price"], path_params: %{}, port: 8000, private: %{HomeworkWeb.Router => {[], %{}}, :phoenix_action => :create, :phoenix_controller => HomeworkWeb.PricesController, :phoenix_endpoint => HomeworkWeb.Endpoint, :phoenix_format => "json", :phoenix_layout => {HomeworkWeb.LayoutView, :app}, :phoenix_request_logger => {"request_logger", "request_logger"}, :phoenix_router => HomeworkWeb.Router, :phoenix_view => HomeworkWeb.PricesView, :plug_session_fetch => #Function<1.77458138/1 in Plug.Session.fetch_session/1>}, query_params: %{}, query_string: "", remote_ip: {127, 0, 0, 1}, req_cookies: %{}, req_headers: [{"accept", "*/*"}, {"accept-encoding", "gzip, deflate, br"}, {"connection", "keep-alive"}, {"content-length", "65"}, {"content-type", "application/json"}, {"host", "localhost:8000"}, {"postman-token", "d5cef312-5fac-43bc-a72d-9330f308dc1b"}, {"user-agent", "PostmanRuntime/7.26.8"}], request_path: "/api/price", resp_body: nil, resp_cookies: %{}, resp_headers: [{"cache-control", "max-age=0, private, must-revalidate"}, {"x-request-id", "FuyjT6d9YEjJwpIAAADC"}], scheme: :http, script_name: [], secret_key_base: :..., state: :unset, status: nil}, %{"_json" => [%{"amount" => 500, "category" => "Sell", "type" => "P"}]})
    (homework 0.1.0) lib/homework_web/controllers/prices_controller.ex:1: HomeworkWeb.PricesController.action/2
    (homework 0.1.0) lib/homework_web/controllers/prices_controller.ex:1: HomeworkWeb.PricesController.phoenix_controller_pipeline/2
    (phoenix 1.5.4) lib/phoenix/router.ex:352: Phoenix.Router.__call__/2
    (homework 0.1.0) lib/homework_web/endpoint.ex:1: HomeworkWeb.Endpoint.plug_builder_call/2
    (homework 0.1.0) lib/plug/debugger.ex:132: HomeworkWeb.Endpoint."call (overridable 3)"/2
    (homework 0.1.0) lib/homework_web/endpoint.ex:1: HomeworkWeb.Endpoint.call/2
    (phoenix 1.5.4) lib/phoenix/endpoint/cowboy2_handler.ex:65: Phoenix.Endpoint.Cowboy2Handler.init/4
    (cowboy 2.8.0) /Users/cjem/projects/elixir/web-homework/elixir/deps/cowboy/src/cowboy_handler.erl:37: :cowboy_handler.execute/2
    (cowboy 2.8.0) /Users/cjem/projects/elixir/web-homework/elixir/deps/cowboy/src/cowboy_stream_h.erl:300: :cowboy_stream_h.execute/3
    (cowboy 2.8.0) /Users/cjem/projects/elixir/web-homework/elixir/deps/cowboy/src/cowboy_stream_h.erl:291: :cowboy_stream_h.request_process/3
    (stdlib 3.16.1) proc_lib.erl:226: :proc_lib.init_p_do_apply/3