Fresco wants to delete my projects

Hello, I started using Fresco not long ago and I've been enjoying it. 
But all of a suden now it's telling me I don't have storage and I need to free space.
I try to export my files to delete them afterwards but it won't let me export anything. The only option is to delete everything I've been working on and spent hours on...
It won't let me open any file either!
Please, what can I do??