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我已经erlang 17.5安装在 /usr/local/lib 中。 evm认为我的“系统”安装。安装 evm 后，我下载erlang 19.2了 ，我可以使用以下命令在两个版本的 erlang 之间来回切换：

$ evm system (erlang 17.5)

$ evm use 19.2  (erlang 19.2)

我能够使用 erlang 17.5 设置透析器，但是当我切换到 erlang 19.2 并尝试设置透析器时，会发生以下情况：

~/erlang_programs$ evm use 19.2

~/erlang_programs$ dialyzer
  Checking whether the PLT /Users/7stud/.dialyzer_plt is up-to-date... no
    (the PLT /Users/7stud/.dialyzer_plt was built with an old version of Dialyzer)
  Compiling some key modules to native code... done in 0m0.24s
  Rebuilding the information in /Users/7stud/.dialyzer_plt...
dialyzer: Analysis failed with error:
Could not scan the following file(s):
Could not get core Erlang code for: /usr/local/lib/erlang/lib/stdlib-2.4/ebin/timer.beam    
Could not get core Erlang code for: /usr/local/lib/erlang/lib/stdlib-2.4/ebin/sys.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/stdlib-2.4/ebin/supervisor_bridge.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/stdlib-2.4/ebin/supervisor.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/stdlib-2.4/ebin/lists.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/stdlib-2.4/ebin/proc_lib.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/stdlib-2.4/ebin/gen_event.beam 
Could not get core Erlang code for: /usr/local/lib/erlang/lib/stdlib-2.4/ebin/gen_server.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/stdlib-2.4/ebin/array.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/kernel-3.2/ebin/seq_trace.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/kernel-3.2/ebin/rpc.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/kernel-3.2/ebin/gen_udp.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/kernel-3.2/ebin/gen_tcp.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/kernel-3.2/ebin/file.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/kernel-3.2/ebin/disk_log.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/kernel-3.2/ebin/code.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/kernel-3.2/ebin/application.beam  
Could not get core Erlang code for: /usr/local/lib/erlang/lib/erts-6.4/ebin/erlang.beam
        Last messages in the log cache:
          Reading files and computing callgraph...
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