NativeQueue not found

Hi,

I've downloaded this package : https://github.com/Unity-Technologies/EntityComponentSystemSamples

... and I'm trying to run it with Unity 2019.3.0f1 on linux... but I keep having this error message :

"The type or namespace name 'NativeQueue<>' could not be found (are you missing a using directive or an assembly reference?)"

I've already googled it, but nothing is helping... I'v just found that it's part of Unity.Collections, but this is already properly declared at the begining of the scripts...

What am I missing ?

 

Not sure if this is same issue but they left out a dependency in entities 0.4

Add Unity.Collections to your project from the package manager

 

Thanks, problem solved