Ruby on rails 忽略gems，因为它的扩展未构建

我在我的机器上安装了导轨

ruby 2.3.1

轨道5.1.4

Ubuntu 16.04操作系统

安装rails后，当我检查rails版本时

rails-v

它抛出忽略“一些宝石列表”，因为它的扩展没有构建

Ignoring nokogiri-1.8.1 because its extensions are not built.  Try: gem pristine nokogiri --version 1.8.1
Ignoring bindex-0.5.0 because its extensions are not built.  Try: gem pristine bindex --version 0.5.0
Ignoring byebug-9.1.0 because its extensions are not built.  Try: gem pristine byebug --version 9.1.0
Ignoring curb-0.9.4 because its extensions are not built.  Try: gem pristine curb --version 0.9.4
Ignoring executable-hooks-1.3.2 because its extensions are not built.  Try: gem pristine executable-hooks --version 1.3.2
Ignoring ffi-1.9.18 because its extensions are not built.  Try: gem pristine ffi --version 1.9.18
Ignoring gem-wrappers-1.3.2 because its extensions are not built.  Try: gem pristine gem-wrappers --version 1.3.2
Ignoring gem-wrappers-1.2.7 because its extensions are not built.  Try: gem pristine gem-wrappers --version 1.2.7
Ignoring nio4r-2.2.0 because its extensions are not built.  Try: gem pristine nio4r --version 2.2.0
Ignoring pg-0.21.0 because its extensions are not built.  Try: gem pristine pg --version 0.21.0
Ignoring websocket-driver-0.6.5 because its extensions are not built.  Try: gem pristine websocket-driver --version 0.6.5
Rails 5.1.4

成功创建新rails应用程序后 当我运行

bundle安装时

它抛出错误消息，如：

An error occurred while installing json (1.8.6), and Bundler cannot continue.
Make sure that `gem install json -v '1.8.6'` succeeds before bundling.

---

我运行命令

gempristine--all

删除所有错误

---

切换ruby版本时发生此错误

尝试1）

gem install json-v'1.8.6'

2）

gem update bundler

after

bundle install

@mayur shahI给出“gem update bundler”“update installed gems Nothing to update”后抛出相同的错误。它不是更新已安装的gems，而是安装更新版本的bundler.你用rvm设置你的ruby版本了吗？你看到这个对我不起作用了吗（浏览所有gem的所有版本可能需要很长时间。升级到莫哈韦后，我必须使用sudo并浏览每个指定的gem。在我的情况下，上述操作不起作用。还重新安装了ruby。如果受影响的gem列表很短，您也可以在此处为每个gem运行

gem pristine gem_name_

）