Thanks for asking and sorry for the trouble you are facing.
It's bit difficult for us to suggest you proper solution as you haven't elaborated the question. Essentially there are two questions, first one being theme is not activating and X is not getting validated. Let's start with first one, can you please confirm whether or not you can activate the theme? Coming to the second question, if there is no issues while activating the theme then while validating the theme do you see any error message in browser and console? If yes, can you please share the same with us?
Also I suggest you to please walk-through our product validation guide https://theme.co/apex/forum/t/setup-product-validation/55.