pods经典错误Unable to find a specification for `AFNetworking (~> 4.0.1)

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$ gem -v

$ gem update --system

可能会报错：
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /Users/xxx/.rbenv/versions/x.x.1/lib/ruby/gems/x.x.0/plugins directory.

这是因为没权限，命令改成：
$ sudo gem update --system

看到这句就说明更新成功了：
RubyGems system software updated

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再次输入$ gem -v
发现已经成功升级了

再次执行$ pod install
还是一样的报错，
抓狂 ...........>(>_<)<

查看pod版本号 gem source -l
升级 pod --version
再次执行$ pod install
还是失败 ...........>(>_<)<

仔细阅读了报错的信息，有一句话是：you can update with pod repo update。
那就执行$ pod repo update

[email protected]

但是。。。

[!] Error installing AFNetworking
[!] /usr/bin/git clone https://github.com/AFNetworking/AFNetworking.git /var/folders/k2/vrc79n8d0nl_v5l5nyj3jl0r0000gn/T/d20210625-39910-v4xx94 --template= --single-branch --depth 1 --branch 4.0.1

Cloning into '/var/folders/k2/vrc79n8d0nl_v5l5nyj3jl0r0000gn/T/d20210625-39910-v4xx94'...
fatal: unable to access 'https://github.com/AFNetworking/AFNetworking.git/': LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443

继续执行pod update

大功告成！！

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