Error when trying to save during tutorial

When I click Save All I get this error.
NOTE: I am following the 5hr tutorial from youtube.

Can’t save …/…/…/…/…/UE5BeginnerTutorial/CreekBeginner/Content/CreekAssets/Maps/Creek.umap: Graph is linked to private object(s) in an external package.
External Object(s):

Try to find the chain of references to that object (may take some time)?

If I click Yes, I get:

The asset ‘/Game/CreekAssets/Maps/Creek’ (Creek.umap) failed to save.

Cancel: Stop saving all assets and return to the editor.
Retry: Attempt to save the asset again.
Continue: Skip saving this asset only.

I am able to continue the tutorial, but I am afraid to close the program since I do not know what will and wont save.
NOTE: I am completely new to all this so hopefully its an easy fix, but I will need detailed step by step instructions. I am 4 hours and 25 min into tutorial and I been at this for 2 days. But Today alone I put about 10 hours into it. I started today by opening the Medieval Map to Migrate Materials I think its called.


Did you figure this out? I’m having the same problem.

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Same problem!

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