Can't save anything after updating to 4.2.0.

Development Rendering
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1

After using the convert option and copy option the system will no let me make and save materials used in the 4.1 version.

Can’t save …/…/…/…/…/…/Users/kevin/Documents/Unreal Projects/RPGSystem_Demo 4.2/Content/TextureLibrary/MaterialFunctions/MAT_Ground.uasset: Graph is linked to object(s) in external map.
External Object(s):
/Engine/Transient

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

2

It seems to work after closing the editor and remaking the changes.