HELP! - Unity aborts my Compilations mid build (2017.2.0f3 64bit Mac High Sierra)

Hello everybody!

I'm currently building some apps for the ARKit platform with IOS. Everything is going well, and no specific compiler errors show up, so I'm getting ready to do my first test builds.

The problem is that every time i "focus" the Unity window, I get two new compiler errors:

• The readonly asset Packages/com.unity.analytics@1.0.1/UnityEngine.Analytics.xml is missing its meta!
  
  
  
• The readonly asset Packages/com.unity.purchasing@1.0.1/UnityEngine.Purchasing.xml is missing its meta!

I have no idea how to solve this. I've reinstalled Unity a lot of times. And both this installation and this project is super fresh. Has anyone here suffered from the same issue as me? It's failing my builds even though it has nothing to do with my project. Help!