Score is Invalid? | MuseScore

This sub-forum (Made with Musescore) is intended to be used to show off what you’ve scored with MuseScore. You would probably be better off posting this elsewhere. In this case, likely the Support and bug reports sub-forum (musescore.org/en/forum/6), intended as the place to ask for help and report bugs, would be the best choice.

That said, if you left your laptop on, with MuseScore Studio running and closed it, that is well known to cause problems in open files. Always best to exit the program if you’re going to put the laptop to sleep, rather than shutting down.