Does my site have a bug? Can’t use any shop plugins

Hi, relative newbie here.
Up until now I have been using e-shop plugin on my inove site, no probs at all.
Then all of a sudden I started getting these warning message/codes at the top of my page.
I have tried deactivating, reactivating, unistalling, re-instlling, then eventually decided to give another shop plugin a go instead. I am getting the same problem every time I activate any type of shop plugin.
I have deactivated ALL my other plugins to see if that helped, same problem.
I can only wonder if I have picked up a bug somewhere.
here’s my site https://budgetmama.com
My business grinds to a halt until I sort this out. Can anyone help?

Thanks in advance