What happened

I got this app a little while ago but then I stopped using it and I hadnt bought anything off of it ( I have no clue if this has anything to do with my issue). So after a while I decided that I needed a new sweatshirt so I went on to this app and set everything up and right before I got to save my design it crashed!!! Now every single time I go on it crashes within the first minute and now I cant use it.

Unicornluver9036892 about Snaptee｜Print,Design,Clothing