How to fix save error?

I had uploaded one of my assets to a project but when i try to duplicate it and save, this issue pops up:

Can’t save …/…/…/…/Unreal Engine Projects/MyProject/Content/Medieval_Castle_Environment/Maps/BossArea2.umap: Graph is linked to object Texture2D /Game/Medieval_Castle_Environment/Maps/Map_MedievalCastle_Settlement.Texture2D_292 (ParameterValue) in external map

Any idea on how i can fix this issue?

For anyone who runs into this issue, I simply made a new blank map, then copied everything in the level i wanted to duplicate and placed it into the blank map. Although there is some random trees i need to get rid of, this solved the issue i ran into the day prior.