Thanks for sharing. Same result, which hints that the Save was corrupted.
Search the PC for .VPJ files. Back ups should exist, and one may salvage at least a portion of the project.
Save Project File AS routinely, giving it a unique # or name, so as not to overwrite prior saves. Using Save Project Files (no AS) will overwrite. From the HOME tab, the AS choice is available by clicking the caret to the right of the Save Project button on the toolbar. That way you're protected, and shouldn't lose anything.