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當我在elixir 1.3.3和phoenix 1.2.1下運行mix phoenix.server時，我得到了這個錯誤：https://github.com/oarrabi/phoenix_facebook_echo_bot不能在Elixir 1.3.3上使用Phoenix 1.2.1
[email protected]:~/elixir/phoenix_facebook_echo_bot$ mix phoenix.server
==> httpotion
Compiling 1 file (.ex)
== Compilation error on file lib/httpotion.ex ==
** (ArgumentError) Access is not a protocol
(elixir) lib/protocol.ex:76: Protocol.assert_protocol!/2
lib/httpotion.ex:292: (module)
(stdlib) erl_eval.erl:670: :erl_eval.do_apply/6
could not compile dependency :httpotion, "mix compile" failed. You can recompile this dependency with "mix deps.compile httpotion", update it with "mix deps.update httpotion" or clean it with "mix deps.clean httpotion"
我試圖從照做：myfreeweb/httpotion＃87
後來，當我做混合deps.update --all，然後我得到了以下錯誤：
[email protected]:~/elixir/phoenix_facebook_echo_bot$ mix deps.update --all
Running dependency resolution
Failed to use "httpotion" (versions 3.0.0 to 3.0.2) because
facebook_messenger (versions 0.2.0 and 0.3.0) requires ~> 2.2
mix.exs specifies ~> 3.0.0
Failed to use "poison" (version 2.2.0) because
phoenix (version 1.2.1) requires ~> 1.5 or ~> 2.0
phoenix_facebook_messenger (versions 0.1.0 and 0.3.0) requires ~> 2.1.0
** (Mix) Hex dependency resolution failed, relax the version requirements of your dependencies or unlock them (by using mix deps.update or mix deps.unlock). If you are unable to resolve the conflicts you can try overriding with {:dependency, "~> 1.0", override: true}
請告訴我該怎麼做才能解決這個「循環」問題g依賴性錯誤「？
試試'rm -rf _build && mix compile' –