I am trying to set up IAP in my game now, but no matter what i do, i cant get past this error. I cant even test it on my device because this error wont even show the mock store in the unity editor. any ideas what causes this?
Is the In App Purchasing package installed? If it is, is it up to date?
installed as in imported from the services tab? if so then yes. and i just updated the import through the asset store, so i think i should be up to date.
No, from the Package Manager. What version of Unity are you using?
I am using unity 2019.1.0f2 personal.
and i am using unity IAP version 2.0.6
If you installed In App Purchasing through the Asset Store, remove it and install the version you’ll find in the Package Manager instead.
Ok so i did that, and now it works perfectly in the editor. but when i go through google play, nothing happens when i click the button on the actual app. i see feedback of the button being clicked but no prompt to purchase comes up. I have the products listed in the google play console but nothing comes up.
That’s an entirely new problem. Maybe you should create a new thread; I cannot help you there. 
Please provide the device logs
the entire log, or a snippet around the purchase log?
The complete logs for the single session How To - Capturing Device Logs on Android as an attachment .