[Export for jpeg and png stopped working]

I have been using Affiinity Publisher since for a few months with no issues. All of the sudden a couple days ago, the export feature stopped working properly particularly for jpeg and png, although pdf seemed fine. And it was also crashing. I tried updating the app and I dont think it fixed the issue. When I try exporting to jpeg or png, it saves as an affinity publisher file instead. Any ideas? thank you