Help Backends missing?

[blanknot]

Thank you, Jose. That's what it was. Collections wasn't shown in the Unity Registry. Jobs isn't shown either, for some reason. I added Collections via a git URL, and now the warning on the Obi Solver has gone away.  

All 3 packages can actually be install by simply installing Collections, since Collections depends on Burst and Burst depends on Mathematics.

For anyone wondering, to install Collections, perform the following steps:

1. Press the + button at the top-left corner of the Package Manager tab
   
2. Select "Add package from git URL"
   
3. Enter "com.unity.collections"
   
4. Press "Add"
   
5. Wait for it to install
   

https://docs.unity3d.com/2018.4/Document...tions.html

Thanks again!