ERROR： gem install cocoapods-packager

```sh
Invalid gemspec in [/Library/Ruby/Gems/2.6.0/specifications/cocoapods-1.11.2.gemspec]: /Library/Ruby/Gems/2.6.0/specifications/cocoapods-1.11.2.gemspec:74: syntax error, unexpected end, expecting end-of-input
    end
    ^~~
ERROR:  While executing gem ... (NoMethodError)
    undefined method `name' for nil:NilClass
```

The environment：
* macOS 12.1
* MBP Apple M1 Pro