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I cannot save my map

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    I cannot save my map

    Hello everyone,

    I've searched online and I've seen others have similar problems but in past versions of the Unreal Engine. I've read that its a bug that got fixed and other sources provide somewhat confusing fixes for the issue in previous builds of Unreal.

    The Problem
    Everything is fine and I can save my world up until I place a single blueprint/object into my scene.
    Click image for larger version

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    Here is the blueprint for the object. Nothing is in the event graph. Its all in the construction graph.
    Click image for larger version

Name:	BPforsphere.png
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    It then says this when I try to save. "Can't save ../../../../NewProjectCombat/Content/ThirdPersonBP/Maps/ThirdPersonExampleMap.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)?"

    I don't understand what the issue is. What object(s) are private and how do I make them public? What external package has these objects? It mentions the MaterialInstanceDynamic which I assume is referring to a material, "GhostMeshMaterial" that I made and channeled into a dynamic material instance, "Dynamic Ghost Material".