elixir -加载模块时出错ranch_server -使用20编译器重新编译此模块

Question

我正在尝试运行一个现有的灵丹妙药项目，它可以在我的另一台计算机上运行，也可以在一台新计算机上运行(这两台计算机都是mac)。

当我运行iex -S mix时，我得到：

iex -S mix
Erlang/OTP 20 [erts-9.3] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:10] [hipe] [kernel-poll:false]


11:47:52.651 [error] Loading of /Users/benjamin/vepo/api/_build/dev/lib/ranch/ebin/ranch_server.beam failed: :badfile


11:47:52.651 [error] beam/beam_load.c(1863): Error loading module ranch_server:
  This BEAM file was compiled for a later version of the run-time system than 20.
  To fix this, please recompile this module with an 20 compiler.
  (Use of opcode 164; this emulator supports only up to 159.)



11:47:52.657 [info]  Application ranch exited: :ranch_app.start(:normal, []) returned an error: shutdown: failed to start child: :ranch_server
    ** (EXIT) an exception was raised:
        ** (UndefinedFunctionError) function :ranch_server.start_link/0 is undefined (module :ranch_server is not available)
            (ranch) :ranch_server.start_link()
            (stdlib) supervisor.erl:365: :supervisor.do_start_child/2
            (stdlib) supervisor.erl:348: :supervisor.start_children/3
            (stdlib) supervisor.erl:314: :supervisor.init_children/2
            (stdlib) gen_server.erl:365: :gen_server.init_it/2
            (stdlib) gen_server.erl:333: :gen_server.init_it/6
            (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
** (Mix) Could not start application ranch: :ranch_app.start(:normal, []) returned an error: shutdown: failed to start child: :ranch_server
    ** (EXIT) an exception was raised:
        ** (UndefinedFunctionError) function :ranch_server.start_link/0 is undefined (module :ranch_server is not available)
            (ranch) :ranch_server.start_link()
            (stdlib) supervisor.erl:365: :supervisor.do_start_child/2
            (stdlib) supervisor.erl:348: :supervisor.start_children/3
            (stdlib) supervisor.erl:314: :supervisor.init_children/2
            (stdlib) gen_server.erl:365: :gen_server.init_it/2
            (stdlib) gen_server.erl:333: :gen_server.init_it/6
            (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Benjamins-MacBook-Pro:api benjamin$

我想我需要重新编译ranch_server.beam。我该怎么做？

Answer 1

看起来您需要安装Erlang 21.0或更高版本。您当前运行的是版本20。计算机上运行的版本是什么？

ASDF对于在同一台机器上管理多个版本的erlang非常有用。

或者，如果只想重新编译依赖项，可以尝试

mix do deps.clean ranch_server, deps.get, deps.compile