[2020] I don’t have enough currency?

As others said, There are two currencies used in the Guild Event Store, GET1 (you have 2370 of it) and GET2 (you have 0). Different items cost either GET1 or GET2 (you can differentiate based on the currency icon). If you try to purchase something that costs GET2, you will get that message since you don't have any GET2. I hope this makes sense and clarifies what's going on.