今天想要创建podfile ，运行命令pod init 遇到报错
pod init 报错Searching for inspections failed: undefined method `map’ for nil
解决方法：
步骤1: Right click project Folder in Xcode and convert to group
步骤 2: 右击 projectname.xcodeproj 用法外部编辑器打开，
删除以下两行
minimizedProjectReferenceProxies = 1;
preferredProjectObjectVersion = 77;
步骤3： 更新objectVersion
objectVersion = 77;修改为 objectVersion = 56;
再次运行pod init应该 可以正常运行了。
注意以下方法可能是无效的
sudo arch -x86_64 gem install ffi。 //该方法无效
### Error
“`
RuntimeError – `PBXGroup` attempted to initialize an object with unknown ISA `PBXFileSystemSynchronizedRootGroup` from attributes: `{“isa”=>”PBXFileSystemSynchronizedRootGroup”, “exceptions”=>[“B9FDA99A2CE1BE91004504B3”], “path”=>”pdftool”, “sourceTree”=>”<group>”}`
If this ISA was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project/object.rb:359:in `rescue in object_with_uuid’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project/object.rb:349:in `object_with_uuid’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project/object.rb:300:in `block (2 levels) in configure_with_plist’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project/object.rb:299:in `each’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project/object.rb:299:in `block in configure_with_plist’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project/object.rb:296:in `each’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project/object.rb:296:in `configure_with_plist’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project.rb:272:in `new_from_plist’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project/object.rb:350:in `object_with_uuid’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project/object.rb:290:in `block in configure_with_plist’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project/object.rb:287:in `each’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project/object.rb:287:in `configure_with_plist’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project.rb:272:in `new_from_plist’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project.rb:213:in `initialize_from_file’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/xcodeproj-1.25.0/lib/xcodeproj/project.rb:113:in `open’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/command/init.rb:41:in `validate!’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/claide-1.1.0/lib/claide/command.rb:333:in `run’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/command.rb:52:in `run’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/bin/pod:55:in `<top (required)>’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/bin/pod:25:in `load’
/opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/bin/pod:25: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=%60PBXGroup%60+attempted+to+initialize+an+object+with+unknown+ISA+%60PBXFileSystemSynchronizedRootGroup%60+from+attributes%3A+%60%7B%22isa%22%3D%3E%22PBXFileSystemSynchronizedRootGroup%22%2C+%22exceptions%22%3D%3E%5B%22B9FDA99A2CE1BE91004504B3%22%5D%2C+%22path%22%3D%3E%22pdftool%22%2C+%22sourceTree%22%3D%3E%22%3Cgroup%3E%22%7D%60%0AIf+this+ISA+was+generated+by+Xcode+please+file+an+issue%3A+https%3A%2F%2Fgithub.com%2FCocoaPods%2FXcodeproj%2Fissues%2Fnew&type=Issues
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Searching for inspections failed: undefined method `map’ for nil