ionic build initial fail

**Note: for support questions, please use one of these channels:**

https://forum.ionicframework.com/
http://ionicworldwide.herokuapp.com/

**Note: for build related issues you can open up an issue on the ionic-app-scripts repo**

https://github.com/driftyco/ionic-app-scripts

Please ensure that you are on the latest version of the CLI.
`npm view ionic@latest version`

#### What version of the CLI are you using? Output of `ionic --version`
3.0.0-beta7

#### Short description of the problem:
ionic build ios fails, subsequent builds fail thereafter as well. Both outputs attached

#### What behavior are you expecting?
build to succeed

**Steps to reproduce:**
1. npm -g install ionic@beta
2. ionic start
3. ionic serve
4. ionic build ios

```
insert any relevant code between the above and below backticks
```

**Post the output of `ionic info` below please**

Your system information:

Cordova CLI: 6.5.0
Ionic Framework Version: 3.0.1
Ionic CLI Version: 3.0.0-beta7
ios-deploy version: 1.9.1
ios-sim version: 5.0.13
OS: macOS Sierra
Node Version: v6.6.0
Xcode version: Xcode 8.2.1 Build version 8C1002

**Other information:** (e.g. stacktraces, related issues, suggestions how to fix, stackoverflow links, forum links, etc)

Intial Failure
$ ionic cordova build ios
✔ Installing the platform: cordova platform add ios - done!
⠴ Installing the project plugins: cordova plugin add --save { Error
at FatalException.Exception (/Users/jarratt/Development/ionic-egg/node_modules/@ionic/cli-utils/dist/lib/errors.js:8:23)
at FatalException (/Users/jarratt/Development/ionic-egg/node_modules/@ionic/cli-utils/dist/lib/errors.js:17:9)
at Shell. (/Users/jarratt/Development/ionic-egg/node_modules/@ionic/cli-utils/dist/lib/shell.js:46:31)
at throw (native)
at rejected (/Users/jarratt/Development/ionic-egg/node_modules/@ionic/cli-utils/dist/lib/shell.js:5:65)
at process._tickCallback (internal/process/next_tick.js:103:7) name: 'Exception', exitCode: 1 }

Secondary build fail
ionic cordova build ios
Running app-scripts build: --iscordovaserve --externalIpRequired --nobrowser
[08:00:21] build dev started ...
[08:00:21] clean started ...
[08:00:21] clean finished in 2 ms
[08:00:21] copy started ...
[08:00:21] transpile started ...
[08:00:23] transpile finished in 1.93 s
[08:00:23] preprocess started ...
[08:00:23] deeplinks started ...
[08:00:23] deeplinks finished in 22 ms
[08:00:23] preprocess finished in 22 ms
[08:00:23] webpack started ...
[08:00:23] copy finished in 2.06 s
[08:00:30] webpack finished in 7.47 s
[08:00:30] sass started ...
[08:00:31] sass finished in 904 ms
[08:00:31] postprocess started ...
[08:00:31] postprocess finished in 47 ms
[08:00:31] lint started ...
[08:00:31] build dev finished in 10.40 s
✔ Running build - done!
⠏ Executing cordova command: cordova build ios [08:00:33] lint finished in 1.54 s
⠙ Executing cordova command: cordova build ios [ERROR] An error occurred while running the above command (exit code 1):

** BUILD FAILED **

The following build commands failed:
CompileC /Users/jarratt/Library/Developer/Xcode/DerivedData/MyApp-bfmkixvulxtdwygczqvddidmdxfi/Build/Intermediates/MyApp.build/Debug-iphonesimulator/MyApp.build/Objects-normal/x86_64/AppDelegate.o MyApp/Classes/AppDelegate.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler
CompileC /Users/jarratt/Library/Developer/Xcode/DerivedData/MyApp-bfmkixvulxtdwygczqvddidmdxfi/Build/Intermediates/MyApp.build/Debug-iphonesimulator/MyApp.build/Objects-normal/x86_64/MainViewController.o MyApp/Classes/MainViewController.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler
CompileC /Users/jarratt/Library/Developer/Xcode/DerivedData/MyApp-bfmkixvulxtdwygczqvddidmdxfi/Build/Intermediates/MyApp.build/Debug-iphonesimulator/MyApp.build/Objects-normal/x86_64/CDVDevice.o MyApp/Plugins/cordova-plugin-device/CDVDevice.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler
CompileC /Users/jarratt/Library/Developer/Xcode/DerivedData/MyApp-bfmkixvulxtdwygczqvddidmdxfi/Build/Intermediates/MyApp.build/Debug-iphonesimulator/MyApp.build/Objects-normal/x86_64/CDVViewController+SplashScreen.o MyApp/Plugins/cordova-plugin-splashscreen/CDVViewController+SplashScreen.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler
(4 failures)
Error: Error code 65 for command: xcodebuild with args: -xcconfig,/Users/jarratt/Development/ionic-egg/platforms/ios/cordova/build-debug.xcconfig,-workspace,MyApp.xcworkspace,-scheme,MyApp,-configuration,Debug,-sdk,iphonesimulator,-destination,platform=iOS Simulator,name=iPhone 5s,build,CONFIGURATION_BUILD_DIR=/Users/jarratt/Development/ionic-egg/platforms/ios/build/emulator,SHARED_PRECOMPS_DIR=/Users/jarratt/Development/ionic-egg/platforms/ios/build/sharedpch