pod installで起きたエラー　[!] Oh no, an error occurred.

つい先日、pod installをした時に、以下のようなエラーが出た。

[!] Oh no, an error occurred.

Search for existing GitHub issues similar to yours:
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Looking for related issues on cocoapods/cocoapods...
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and 87 more at:
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[!] [!] Xcodeproj doesn't know about the following attributes {"inputFileListPaths"=>[], "outputFileListPaths"=>[]} for the 'PBXShellScriptBuildPhase' isa.
If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new

[!] [!] Xcodeproj doesn't know about the following attributes {"inputFileListPaths"=>["${PODS_ROOT}/Target Support Files/Pods-MagMag-Dev/Pods-MagMag-Dev-frameworks-${CONFIGURATION}-input-files.xcfilelist"], "outputFileListPaths"=>["${PODS_ROOT}/Target Support Files/Pods-MagMag-Dev/Pods-MagMag-Dev-frameworks-${CONFIGURATION}-output-files.xcfilelist"]} for the 'PBXShellScriptBuildPhase' isa.
If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new

[!] [!] Xcodeproj doesn't know about the following attributes {"inputFileListPaths"=>[], "outputFileListPaths"=>[]} for the 'PBXShellScriptBuildPhase' isa.
If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new

[!] [!] Xcodeproj doesn't know about the following attributes {"inputFileListPaths"=>[], "outputFileListPaths"=>[]} for the 'PBXShellScriptBuildPhase' isa.
If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new

[!] [!] Xcodeproj doesn't know about the following attributes {"inputFileListPaths"=>["${PODS_ROOT}/Target Support Files/Pods-MagMag-Stg/Pods-MagMag-Stg-frameworks-${CONFIGURATION}-input-files.xcfilelist"], "outputFileListPaths"=>["${PODS_ROOT}/Target Support Files/Pods-MagMag-Stg/Pods-MagMag-Stg-frameworks-${CONFIGURATION}-output-files.xcfilelist"]} for the 'PBXShellScriptBuildPhase' isa.
If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new

[!] [!] Xcodeproj doesn't know about the following attributes {"inputFileListPaths"=>[], "outputFileListPaths"=>[]} for the 'PBXShellScriptBuildPhase' isa.
If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new

[!] [!] Xcodeproj doesn't know about the following attributes {"inputFileListPaths"=>[], "outputFileListPaths"=>[]} for the 'PBXShellScriptBuildPhase' isa.
If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new

[!] [!] Xcodeproj doesn't know about the following attributes {"inputFileListPaths"=>["${PODS_ROOT}/Target Support Files/Pods-MagMag-Prod/Pods-MagMag-Prod-frameworks-${CONFIGURATION}-input-files.xcfilelist"], "outputFileListPaths"=>["${PODS_ROOT}/Target Support Files/Pods-MagMag-Prod/Pods-MagMag-Prod-frameworks-${CONFIGURATION}-output-files.xcfilelist"]} for the 'PBXShellScriptBuildPhase' isa.
If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new

[!] [!] Xcodeproj doesn't know about the following attributes {"inputFileListPaths"=>[], "outputFileListPaths"=>[]} for the 'PBXShellScriptBuildPhase' isa.
If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new

色々調べてると、podをupgradeすれば治るらしいのでとりあえずupgradeしてsetupし直した。

brew upgrade cocoapods

またしても同じエラーが発生

podのversionを見てみると、1.5.1 ????　古すぎる

別のパスにもCocoaPodsがinstallされている？

 which pod

/usr/local/bin/podと/opt/homebrew/bin/pod に２つあったため、うまくいかなかった。

パスを指定してpodの削除

 sudo rm /opt/homebrew/bin/pod

そしたらversionが最新になっていて解決しました。