Calendar events disappeared, app shows "no access" message

I am no longer able to see my appointments/events on my calendar it just disappeared one day and when I go to add an event it says “This app does not have access to your calendar” even though I’m in the calendar app. It tells me to go to privacy settings but I don’t see anything there that needs fixed. Please help it’s driving me crazy. I also went to iCloud and don’t see anything there to fix.

Thank you.