Calendar won't open

So I've only been using the app dugout a couple of months but I find it useful, especially the calender where I can see my ongoing cycle plotted in calender days.

For the last week or so it won't open any more. I click on the calendar symbol but it just comes up with the prediction updated screen. It's the same if I click on the fertility circle to get to the other calendar tab.

It's really annoying and id love to get it fixed as its really useful to see my cycle over the month and the year.

Can someone help?? I'd uninstall the app and reinstall it but it's backdated with all my cycle dates for the last year and I don't want to have to enter them again...

Thanks