Saving error removing the files

I was working on blueprint course, but cant seam to save the blueprint actions for the drone patrolling and it also seams to have deleted my blueprint actions completely after I attempted to save. Any insight to what maybe causing this error would be really helpful
images of error attached:

The most common cause is that there’s another instance of your project running in the background, it would be interesting to know what the output log says when you attempt to save.

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