[🐣질문] 프로빌더로 만든 프리팹 맵이 사라지는 이유가??

[익명(223.194)]

이러면서 잘 만드어놨던

3층 갑판 배가 없어져서 어리둥절..

에러 메시지를 보면..

NullReferenceException: Object reference not set to an instance of an object

UnityEngine.ProBuilder.SharedVertex.GetSharedVertexLookup (System.Collections.Generic.IList`1[T] sharedVertices, System.Collections.Generic.Dictionary`2[TKey,TValue] lookup) (at Library/PackageCache/com.unity.probuilder@4.5.0/Runtime/Core/SharedVertex.cs:146)

UnityEngine.ProBuilder.ProBuilderMesh.get_sharedVertexLookup () (at Library/PackageCache/com.unity.probuilder@4.5.0/Runtime/Core/ProBuilderMesh.cs:324)

UnityEngine.ProBuilder.ProBuilderMesh.CacheSelection () (at Library/PackageCache/com.unity.probuilder@4.5.0/Runtime/Core/ProBuilderMeshSelection.cs:106)

UnityEngine.ProBuilder.ProBuilderMesh.get_selectedSharedVerticesCount () (at Library/PackageCache/com.unity.probuilder@4.5.0/Runtime/Core/ProBuilderMeshSelection.cs:64)

UnityEditor.ProBuilder.MeshSelection.RecalculateSelectedComponentCounts () (at Library/PackageCache/com.unity.probuilder@4.5.0/Editor/EditorCore/MeshSelection.cs:273)

UnityEditor.ProBuilder.MeshSelection.OnComponentSelectionChanged () (at Library/PackageCache/com.unity.probuilder@4.5.0/Editor/EditorCore/MeshSelection.cs:223)

UnityEditor.ProBuilder.MeshSelection.OnObjectSelectionChanged () (at Library/PackageCache/com.unity.probuilder@4.5.0/Editor/EditorCore/MeshSelection.cs:197)

널 레퍼런스 오류가 뜨는데

이유가 뭘까요.. 몇주동안 만든 맵이 사라지니 오지게 심란합니다..