title: Flutter Fails on Run (or upgrade, or anything else).
body: <p>I have been getting a massive error recently, upon Running any of my flutter applications in Intellij, Visual Studio, etc. I cannot perform git functions because of it either. Any help would be greatly appreciated. </p>
  
  <pre><code>(Some parts omitted - this snippet represents the 40k line code pattern)
  
  Launching lib/main.dart on iPhone X in debug mode...
  compiler message: 
  
   file:///Users/JohnnySmithh/Documents/flutter/packages/flutter/lib/src/widgets/editable_text.dart:439:9: Error: Type 'LayerLink' not found.
  compiler message:   final LayerLink _layerLink = new LayerLink();
  compiler message:         ^
  compiler message: file:///Users/JohnnySmithh/Documents/flutter/packages/flutter/lib/src/rendering/proxy_box.dart:4474:20: Error: The method 'getLastTransform' isn't defined for the class 'invalid-type'.
  compiler message: Try correcting the name to the name of an existing method, or defining a method named 'getLastTransform'.
  compiler message:     return _layer?.getLastTransform() ?? new Matrix4.identity();
  compiler message:                    ^
  compiler message: file:///Users/JohnnySmithh/Documents/flutter/packages/flutter/lib/src/rendering/proxy_box.dart:4501:18: Error: Method not found: 'FollowerLayer'.
  compiler message:     _layer = new FollowerLayer(
  compiler message:                  ^^^^^^^^^^^^^
  compiler message: file:///Users/JohnnySmithh/Documents/flutter/packages/flutter/lib/src/rendering/texture.dart:76:7: Error: No named parameter with the name 'rect'.
  compiler message:       rect: new Rect.fromLTWH(offset.dx, offset.dy, size.width, size.height),
  compiler message:       ^^^^
  compiler message: file:///Users/JohnnySmithh/Documents/flutter/packages/flutter/lib/src/rendering/view.dart:124:11: Error: 'ContainerLayer' isn't a type.
  compiler message:     final ContainerLayer rootLayer = TransformLayer(transform: _rootTransform);
  compiler message:           ^^^^^^^^^^^^^^
  compiler message: file:///Users/JohnnySmithh/Documents/flutter/packages/flutter/lib/src/rendering/view.dart:124:38: Error: Method not found: 'TransformLayer'.
  compiler message:     final ContainerLayer rootLayer = TransformLayer(transform: _rootTransform);
  compiler message:                                      ^^^^^^^^^^^^^^
  compiler message: file:///Users/JohnnySmithh/Documents/flutter/packages/flutter/lib/src/rendering/view.dart:124:38: Error: The method 'TransformLayer' isn't defined for the class '#lib1::RenderView'.
  compiler message: Try correcting the name to the name of an existing method, or defining a method named 'TransformLayer'.
  compiler message:     final ContainerLayer rootLayer = TransformLayer(transform: _rootTransform);
  compiler message:                                      ^
  compiler message: file:///Users/JohnnySmithh/Documents/flutter/packages/flutter/lib/src/rendering/view.dart:125:15: Error: The method 'attach' isn't defined for the class 'invalid-type'.
  compiler message: Try correcting the name to the name of an existing method, or defining a method named 'attach'.
  compiler message:     rootLayer.attach(this);
  compiler message:               ^
  compiler message: file:///Users/JohnnySmithh/Documents/flutter/packages/flutter/lib/src/rendering/view.dart:195:13: Error: The method 'addToScene' isn't defined for the class 'invalid-type'.
  compiler message: Try correcting the name to the name of an existing method, or defining a method named 'addToScene'.
  compiler message:       layer.addToScene(builder, Offset.zero);
  compiler message:             ^
  compiler message: file:///Users/JohnnySmithh/Documents/flutter/packages/flutter/lib/src/rendering/view.dart:215:58: Error: The method 'find' isn't defined for the class 'invalid-type'.
  compiler message: Try correcting the name to the name of an existing method, or defining a method named 'find'.
  compiler message:     final SystemUiOverlayStyle upperOverlayStyle = layer.find&lt;SystemUiOverlayStyle&gt;(top);
  compiler message:                                                          ^
  compiler message: file:///Users/JohnnySmithh/Documents/flutter/packages/flutter/lib/src/rendering/view.dart:220:35: Error: The method 'find' isn't defined for the class 'invalid-type'.
  compiler message: Try correcting the name to the name of an existing method, or defining a method named 'find'.
  compiler message:         lowerOverlayStyle = layer.find&lt;SystemUiOverlayStyle&gt;(bottom);
  compiler message:                                   ^
  Compiler failed on /Users/JohnnySmithh/IdeaProjects/MyCoolProject/lib/main.dart
  Error launching application on iPhone X.
  Exited (sigterm)
  </code></pre>