TagManagement does not exist in the namespace CallumP

[lxpk]

With 2.10 I get this error (both from master and after importing the package):
Assets\TradeSys\Controller.cs(5,15): error CS0234: The type or namespace name 'TagManagement' does not exist in the namespace 'CallumP' (are you missing an assembly reference?)
Assets\TradeSys\Example\CreatePostsTraders.cs(3,15): error CS0234: The type or namespace name 'TagManagement' does not exist in the namespace 'CallumP' (are you missing an assembly reference?)
Assets\TradeSys\Controller.cs(508,16): error CS0246: The type or namespace name 'ObjectTags' could not be found (are you missing a using directive or an assembly reference?)
Assets\TradeSys\Controller.cs(78,9): error CS0246: The type or namespace name 'TagManager' could not be found (are you missing a using directive or an assembly reference?)
Assets\TradeSys\TradePost.cs(30,16): error CS0246: The type or namespace name 'TagManagement' could not be found (are you missing a using directive or an assembly reference?)
Assets\TradeSys\Trader.cs(34,16): error CS0246: The type or namespace name 'TagManagement' could not be found (are you missing a using directive or an assembly reference?)
I'm using Unity 2019 LTS if that helps. But it seems like there's a missing dependency. Do I need to add this to the purchased package to get it to work? That isn't available now.

Also, TradeSys looks amazing and thank you for making it even if you can't continue working on it fully now. Quite an achievement.

[lxpk]

I found the notes in the manual to the missing package: https://assetstore.unity.com/packages/tools/utilities/tagmanagement-43204
Problem solved.