项目场景：
最近项目执行 pod install 时报错
[!] Oh no, an error occurred.
一溜溜的，好吧，报错就解决呗
接下来经过一个小时又一个小时的煎熬，从配置，到神经ruby，再到升级CocoaPods、、、经过漫长的跋涉。。。纳尼！！！没解决、、、最终找到如下解决方案：
问题描述
JSON::ParserError - 416: unexpected token at '"SharedTestUtilities/FIROptionsMock'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/json/common.rb:156:in `parse'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/json/common.rb:156:in `parse'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-core-1.11.3/lib/cocoapods-core/specification/json.rb:61:in `from_json'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-core-1.11.3/lib/cocoapods-core/specification.rb:748:in `from_string'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-core-1.11.3/lib/cocoapods-core/specification.rb:722:in `from_file'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-core-1.11.3/lib/cocoapods-core/source.rb:188:in `specification'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-core-1.11.3/lib/cocoapods-core/specification/set.rb:58:in `block in specification_name'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-core-1.11.3/lib/cocoapods-core/specification/set.rb:56:in `each'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-core-1.11.3/lib/cocoapods-core/specification/set.rb:56:in `specification_name'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-core-1.11.3/lib/cocoapods-core/cdn_source.rb:216:in `search'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-core-1.11.3/lib/cocoapods-core/source/aggregate.rb:83:in `block in search'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-core-1.11.3/lib/cocoapods-core/source/aggregate.rb:83:in `select'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-core-1.11.3/lib/cocoapods-core/source/aggregate.rb:83:in `search'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/resolver.rb:416:in `create_set_from_sources'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/resolver.rb:385:in `find_cached_set'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/resolver.rb:360:in `specifications_for_dependency'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/resolver.rb:165:in `search_for'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/resolver.rb:274:in `block in sort_dependencies'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/resolver.rb:267:in `each'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/resolver.rb:267:in `sort_by'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/resolver.rb:267:in `sort_by!'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/resolver.rb:267:in `sort_dependencies'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/delegates/specification_provider.rb:60:in `block in sort_dependencies'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/delegates/specification_provider.rb:77:in `with_no_such_dependency_error_handling'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/delegates/specification_provider.rb:59:in `sort_dependencies'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:754:in `push_state_for_requirements'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:744:in `require_nested_dependencies_for'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:727:in `activate_new_spec'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:684:in `attempt_to_activate'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:254:in `process_topmost_state'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:182:in `resolve'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolver.rb:43:in `resolve'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/resolver.rb:94:in `resolve'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/installer/analyzer.rb:1078:in `block in resolve_dependencies'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/user_interface.rb:64:in `section'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/installer/analyzer.rb:1076:in `resolve_dependencies'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/installer/analyzer.rb:124:in `analyze'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/installer.rb:416:in `analyze'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/installer.rb:241:in `block in resolve_dependencies'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/user_interface.rb:64:in `section'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/installer.rb:240:in `resolve_dependencies'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/installer.rb:161:in `install!'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/command/install.rb:52:in `run'
/Users/tiger/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/lib/cocoapods/command.rb:52:in `run'
/Users/tiger/.rvm/gems/ruby-2.6.3/gems/cocoapods-1.11.3/bin/pod:55:in `<top (required)>'
/Users/tiger/.rvm/gems/ruby-2.6.3/bin/pod:23:in `load'
/Users/tiger/.rvm/gems/ruby-2.6.3/bin/pod:23:in `<main>'
/Users/tiger/.rvm/gems/ruby-2.6.3/bin/ruby_executable_hooks:24:in `eval'
/Users/tiger/.rvm/gems/ruby-2.6.3/bin/ruby_executable_hooks:24:in `<main>'
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[!] Oh no, an error occurred.
Search for existing GitHub issues similar to yours:
https://github.com/CocoaPods/CocoaPods/search?q=416%3A+unexpected+token+at+%27%22SharedTestUtilities%2FFIROptionsMock%27&type=Issues
If none exists, create a ticket, with the template displayed above, on:
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原因分析：
其实就是在升级完cocoapods后，需要执行一下清除。。。瞬间内牛满面啊
解决方案：
使用这一行清除缓存：
sudo rm -rf ~/.cocoapods/repos