Pages and Keynote does not work after update OS Big Sur

Hi! I have a problem after last update of my Mac to OS Big Sur. My Pages and Keynote app cannot load. All the documents and presentations I have created before update cannot be open. When I click on the document all I see is the screen I enclose (,,App Pages unexpectedly ended"). Is it problem on my side or it is the problem of new software? I am really lost cause I am working with these apps every day. I called to Apple Support in our country the whole day, but nobody replies me :/. Thanks.