there are missing scripts and 5 errors + warnings

Hi, Please tell me what error you are receiving?

Assets\Player-Inventory-System-PlayerInventoryv1.1\Assets\PlayerInventorySystem\Scripts\Controller\CatalogPanel.cs(6,26): error CS0234: The type or namespace name 'RuleTile' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)

Assets\Player-Inventory-System-PlayerInventoryv1.1\Assets\PlayerInventorySystem\Scripts\Controller\ItemBar.cs(2,29): error CS0234: The type or namespace name 'BuiltIn' does not exist in the namespace 'UnityEditor.Rendering' (are you missing an assembly reference?)

here are 2 i was able to repeat. i had to create the whole thing because i decided to go with something else. However, thank you for you willingness to help on a free project. (inventory system is lacking a script)

Thanks, I will look into this and let you know as soon as I can. Can you also tell me do you have the new input system installed? 

PlayerInventoryv1.1\Assets\PlayerInventorySystem\Scripts\Controller\ItemBar.cs(2,29): error CS0234: 

refers to the old input system used in this case to scroll the item bar selection... I had no clue this was still in there.. I will update this asap.

And what version on Unity are you on? is this happening in one of the demo's or your own project?

ItemBar.cs(2,29): error is caused packages not being found...you should be able to fix this by updating the using statements at the top of the file remove the line

using static UnityEngine.RuleTile.TilingRuleOutput;

and you should be good.

Thanks for the feed back. Let me know if you find any other issues,