我在/ usr / local / lib中安装了erlang 17.5。 evm认为我的“系统”安装。安装evm之后，我下载了erlang 19.2，我可以在我的两个版本的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...