Map Not Saving

I’m building a level in 4.11 for a class, and I keep running into this same error every time I try to save- the map itself, just the base first person map, isn’t able to save.

The issue began sometime around when I added a new actor- a button the player presses that changes a light, displays some text, and changes a boolean. I’m getting a similar “will not save error” from another actor, though I can go without editing that for now if I have to. Is there something wrong with my file or something? Why am I getting this?

I have same problem in 4.13. I thought that happens due to large size of map file. I’m working only with map, without blueprints editing.
Now i find only solution to “save as” my map under different name and then re-save on original.

guys i finally understand why… this happens because your storage in the hard is full .clear some space and it will work

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open windows task manager, kill other ue editor,

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This was my issue, didn’t notice I had two instances of the same project open. Thanks!

TYSM!