I accidentally deleted the DerivedData folder while trying to delete the files to reset the cache. Now Xcode returns following errors regarding with this folder. I'm using Flutter and Android Studio but building on Xcode to run my app on iPhone. This project is a ongoing and quite mature project so I have to solve these error. When I open a brand new project in Flutter, it works fine without any error. Error # 1 : Sandbox: rsync.samba(12046) deny(1) file-write-create /Users/mycompany/Library/Developer/Xcode/DerivedData/Runner-bfdtmaowyaodbagkvttzeqjhiwjl/Build/Products/Debug-iphonesimulator/Flutter.framework Error # 2 : Sandbox: dart(12019) deny(1) file-write-create /Users/mycompany/Library/Developer/Xcode/DerivedData/Runner-bfdtmaowyaodbagkvttzeqjhiwjl/Build/Products/Debug-iphonesimulator/.last_build_id Error # 3 : Flutter failed to write to a file at "/Users/mycompany/Library/Developer/Xcode/DerivedData/Runner-bfdtmaowyaodbagkvttzeqjhiwjl/Build/Products/Debug-iphonesimulator/.last_build_id".