Issue 1:
I am having trouble with Xcode 10. My code runs just fine with Xcode 9.4.1 but as soon as I use Xcode 10 I get this error. I get this error with both an IOS 11.4 and IOS 12. You can run the code from this repo. https://github.com/Jeremywhiteley/MedEasyAuth

Xcode's output:
↳
error: Multiple commands produce '/Users/jeremywhiteley/Dropbox/MedDev/MedApp/medtexter_app/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework':
1) Target 'Runner' has copy command from '/Users/jeremywhiteley/Dropbox/MedDev/MedApp/medtexter_app/ios/Flutter/Flutter.framework' to '/Users/jeremywhiteley/Dropbox/MedDev/MedApp/medtexter_app/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework'
2) That command depends on command in Target 'Runner': script phase “[CP] Embed Pods Frameworks”
warning: The use of Swift 3 @objc inference in Swift 4 mode is deprecated. Please address deprecated @objc inference warnings, test your code with “Use of deprecated Swift 3 @objc inference” logging enabled, and then disable inference by changing the "Swift 3 @objc Inference" build setting to "Default" for the "Runner" target. (in target 'Runner')
warning: ignoring duplicated output file: '/Users/jeremywhiteley/Dropbox/MedDev/MedApp/medtexter_app/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework' (in target 'Runner')
note: Using new build systemnote: Planning buildnote: Constructing build description
Could not build the application for the simulator.
Error launching application on iPhone X.

Flutter Doctor:

Jeremys-iMac:~ jeremywhiteley$ flutter doctor -v
[✓] Flutter (Channel master, v0.7.5-pre.6, on Mac OS X 10.14 18A377a, locale en-US)
• Flutter version 0.7.5-pre.6 at /Users/jeremywhiteley/flutter
• Framework revision eab5cd9853 (72 minutes ago), 2018-08-30 14:47:04 -0700
• Engine revision dc7b5eb89d
• Dart version 2.1.0-dev.3.0.flutter-760a9690c2

[✓] Android toolchain - develop for Android devices (Android SDK 28.0.2)
• Android SDK at /Users/jeremywhiteley/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.2
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
• All Android licenses accepted.

[✓] iOS toolchain - develop for iOS devices (Xcode 10.0)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 10.0, Build version 10L232m
• ios-deploy 1.9.2
• CocoaPods version 1.5.3

[✓] Android Studio (version 3.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 27.1.1
• Dart plugin version 173.4700
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)

[✓] IntelliJ IDEA Ultimate Edition (version 2018.2.2)
• IntelliJ at /Applications/IntelliJ IDEA.app
• Flutter plugin version 27.1.3
• Dart plugin version 182.4129.13

[✓] VS Code (version 1.26.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 2.17.1

[✓] Connected devices (1 available)
• iPhone X • FA152BE4-13BE-4A13-ACAD-562201194A68 • ios • iOS 11.4 (simulator)

• No issues found!

Issue 2: