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I’m from 7 years into the future guys.

In case yoo’re having this error and you just have one editor open:

Check your task manager for left-over UE4 Processes.

In my case, the editor crashed, and when I reopened it, i Couldn’t save my blueprints. This was because the previous UE4Editor Process was still running. I used the Task Manager in windows (in linux use pkill) to kill the process.

Good luck!

Open Task Manager, go to details, there will be a “UE4 crash hander” kind of program running. close it (Make sure you aren’t closing the actual editor) That helped me save map-built data that wasn’t being saved before.:slight_smile:

You are a life saver! Had the same problem, easy fix is to close the duplicate editor.