Need Your Help To Get To My Admin Page

Hi,

I badly need your help to be able to get through to my admin page.

The site is visible, but I cannot get to the admin page. My Host thinks it might be my theme that needs to be updated (and I believe that too since WPMUDEV is constantly enhancing its products)

Please let me know if you need my cPanel credentials a.s.o

Best Regards!
David R