Thank you James. I deactivated all plugins and the error persists (I have since reactivated). And I was able to switch back to the twenty fifteen theme and that didn't help either. I renamed the .htaccess to .htaccess_1 and that didn't help, I then out it back as .htaccess.
I do not know how to access my server logs, but my hosting company tech support opens at 9am so I will try then and ask them to help me find them and report back. I really appreciate all your help.