ERROR after importing Unity 5 particle pack

Ok, so today i'm writing to y'all because i'm having an issue with Unity 2019.3.0a3

I was chilling, creating my scripts and i needed the unity's particle pack, so i downloaded it, the 1rst issue was that 2 errors in the console that I fixed by updating all of my packages in Window > Package Manager
But here is the 2nd issue i cant solve, here's the message :
Library/PackageCache/com.unity.postprocessing@2.1.7/PostProcessing/Runtime/PostProcessLayer.cs(401,27): error CS0117: 'SystemInfo' does not contain a definition for 'useLoadStoreActions'

I looked for the same kind of issue on internet and didn't found anything so that's why i'm writing here today, hope you will succeed helping me



(Here's my gamejolt's game page ;D : https://gamejolt.com/games/the_playground_pre-alpha001/417694 )

 

Ok so i soled the problem, 3 hours after posting ^^, so i dunno if all the procedure is required but here's how i did :

Just Found the script that was messing up and removed it, so when i relaunched unity it have made a new one, all clean ^^
Then it showed my another error on postprocessing so thought it was a good idea to downgrade my postproccessong asset from Window > Package manager to 2.1.5 verion

Now everything works clean

 

thanks

 

which script bro