I always use rbenv，Until this time after updating cocoapods，Execution error，Of course，Visual inspection should be caused by my ruby environment being too old，So I tried rbenv install 3.0.2 ，But unfortunately，Reported an error，Go to the official warehouse of rbenv to take a look，The last version is still 2019...Okay，[……]
Ruby
If you want to know Ruby，Ruby or want to install several software packages on your computer，You can easily use RubyGems a key to download - just like in the Ubuntu apt-get、Similar redhat in the yum etc.。
so，Want to install Ruby packages，You will need to gem。but，Installation gem (except if your electricity[……]