"One or more errors occurred" immediately upon start of Trados 2021

Or, in Swedish, "Ett eller flera fel har inträffat". This happens as soon as Studio has opened. When I click OK, Studio closes. I can also continue without OK and open my project, but as soon as I enter a new translation, Studio closes. This error message is, of course, totally useless and the person who penned it should be fired. Does anyone have any idea of how to proceed? I have a very big job and am now totally stuck.

I am sorry if this message appears in several places. I am lost in the structure of these discussions.

emoji