unable to open in 2018.2.2f1

[chrismeteu]

I am getting 4 compile errors after loading this project in 2018.2.2f1. Here is one of the errors. Anyone know how to correct this. i have tried removing and re-adding Entities using the packaging manager to no avail.

C:/********/AppData/Local/Unity/cache/packages/staging-packages.unity.com/com.unity.entities@0.0.12-preview.8/Unity.Entities/Injection/InjectComponentGroup.cs(68,97): error CS1644: Feature `out variable declaration' cannot be used because it is not part of the C# 6.0 language specification

[RadeonHD6750]

unable to open in 2018.2.9f1, Too

[zzjfengqing]

unable to open in 2018.2.15, Too

[ieg123com]

unable to open in 2018.2.15, Too

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