我尝试安装Sass。我在此之前安装了Ruby和MSYS2，最新的是Chocolatey:chocoinstallrubychocoinstallmsys2看起来它们已正确安装。ruby-v结果:ruby2.5.0p0(2017-12-25revision61468)[x64-mingw32]当我尝试运行geminstallsass时，我收到以下错误消息:ERROR:Errorinstallingsass:Thelastversionofffi(=0.5.0)tosupportyourRuby&RubyGemswas1.9.18.Tryinstallingitwith`geminstal