Command PhaseScriptExecution failed with a nonzero exit code¶

If an iOS build returns an error similar to the above:

On the terminal¶

flutter clean
flutter pub get
flutter pub upgrade

In Xcode¶

Show Project Navigator → Project → Info → Configurations → for each target (and each target within the target) set the configuration to None.

Again on the terminal¶

cd iOS
rm -rf Pods/ Podfile.lock
pod install
pod update