title: Unity 2019.3.0a7: Microsoft Visual C# Compiler Errors
body: <p>I've upgrade to the most recent Unity build (Unity 2019.3.0a7) and I'm getting a ton of errors, all the same, across different files.</p>
  
  <p>My friends who I'm collaborating with are also running the same version, but don't have the errors.</p>
  
  <p>There are two of them, each referencing different packages, but both referencing multiple errors inside each of the packages.</p>
  
  <p>The errors are along the lines of:</p>
  
  <pre><code>(R) Visual C# Compiler version 2.9.1.65535 (9d34608e)
  Copyright (C) Microsoft Corporation. All rights reserved.
  
  error CS1504: Source file 'D:\[...]\[UnityProject]\Library\PackageCache\com.unity.test-framework@1.0.16\UnityEngine.TestRunner\NUnitExtensions\Commands\BeforeAfterTestCommandState.cs' could not be opened -- The type initializer for 'Microsoft.CodeAnalysis.Text.EncodedStringText' threw an exception.
  </code></pre>
  
  <p>And</p>
  
  <pre><code>Microsoft (R) Visual C# Compiler version 2.9.1.65535 (9d34608e)
  Copyright (C) Microsoft Corporation. All rights reserved.
  
  error CS1504: Source file 'C:\Program Files\Unity\Hub\Editor\2019.3.0a7\Editor\Data\Resources\PackageManager\BuiltInPackages\com.unity.ugui\Runtime\EventSystem\UIBehaviour.cs' could not be opened -- The type initializer for 'Microsoft.CodeAnalysis.Text.EncodedStringText' threw an exception.
  </code></pre>
  
  <p>Theres about 15-20 of these errors reported in the respective error logs in the console, but all say the same thing (same error code) regarding threw an exception.</p>
  
  <p>I've never seen this error before, and I can't find any assistance online with it. All my packages are fully up to date. I'm at a loss.</p>
  
  <p>I'd really appreciate any suggestions on how to fix this.</p>