License corrupt?

Hi,
I wanted to log into the admin panel of my blog a minute ago, and I was greeted by the screen as in the attachment.
I have not made any changes to the blog coding at all, all I have done is started to use a new browser (Vivaldi).

Thank you in advance for any help.
Frankie.
[img]https://www.vlaanderen-flanders.org.uk/blognlimg/2020-02-19 16.14.30 www.vlaanderen-flanders.org.uk 2d9ae1bf8695.jpg[/img]