Steps to reproduce:

1. Open new Unity project
2. Open 'Build Settings' window
3. Select any non-active target DO NOT switch to it
4. Click 'Build' to build the selected target
5. Notice it fails with the following errors:

> Reload Assembly called from managed code directly. This will cause a crash. You should never refresh assets in synchronous mode or enter playmode synchronously from script code.
> ArgumentException: The Assembly UnityEditor is referenced by Unity.TextMeshPro ('Library/ScriptAssemblies/Unity.TextMeshPro.dll'). But the dll is not allowed to be included or could not be found.

Switching to the target first, or re-building after it has been switched automatically before failing will succeed.

Reproduced with: 2018.2.0a1, 2018.2.0a7
Not reproducible with: 2018.1.0b12