The error message you’re encountering, “Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff,” suggests that there’s an issue with the level file you’re trying to load.
This error is usually caused by a corrupted or invalid level file. This can happen for a variety of reasons, such as a crash or system error while the level was being saved, or a problem with the file’s data.
Check if there are any backups of the level file and try to use one of those. Otherwise, try to create a new project, and import your assets into the new project.
It’s worth noting that sometimes when the computer restarts while the editor is open it can cause data corruption, so it’s always a good idea to make sure the project is saved before shutting down the computer.