How do I fix 'The asset '/Game/Maps/Level' (Level.umap) failed to save.' ?

Looking through the new logic level that has started having the same issue. We don’t have any of those objects in there :-/ Sorry, this is VERY frustrating. Thank you for your help so far! The fact that it’s so speratic (some times I can get 3 good saves, some times 1) makes it difficult in multiple ways…