title: Unity built-in Packages Compiler Errors
body: <p>I just started learning how to use Unity to make a simple 3D game.
  It's working fine when it comes to creating the environment, but once I imported the built-in Character package it gave me a compiler error and wouldn't run (All compiler errors have to be fixed before you can enter playmode!).<br/>
  Removing the imported package removes the error and it can run, I tried using other built-in packages like 2D or Cameras but same problem occurred. <br/> <br/> 
  After adding 2D package, here's the console (error with no text):
  <a href="https://i.stack.imgur.com/hiYZe.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hiYZe.png" alt="Compiler Error"></a>
  After adding a character from the package, here's what the Inspector says (the associated script cannot be loaded. please fix all compiler errors and assign a valid script):
  <a href="https://i.stack.imgur.com/lOeDt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lOeDt.png" alt="Script can not be loaded"></a>
  As shown in the pictures I'm using unity 5.6.0f3 64-bit.
  I tried uninstalling and re-downloading it again but that didn't work.
  I tried creating a new empty project, import a package and hit run, still didn't work.</p>
  
  <p><a href="https://i.stack.imgur.com/T49Of.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/T49Of.png" alt="code file"></a></p>