Validation Error: References Disallowed Object

I have a blueprint class, inherited from the “Building Prop” class. I’ve created this class to put some meshes from the fortnite content together as one class. So that I can spawn it from my verse script. I have multiple static mesh components under this class, each have different meshes. But I get validation error for each mesh such as:

 Projects/MyProject/Plugins/MyProject/Content/Props/Tiles/DesertTile.uasset (/MyProject/Props/Tiles/DesertTile) references disallowed object /Game/Creative/Items/Nature_Tiles/Meshes/S_Sand_Solid.S_Sand_Solid.. (FortValidator_FortExposedAssets)
 
 Projects/MyProject/Plugins/MyProject/Content/Props/Tiles/DesertTile.uasset (/MyProject/Props/Tiles/DesertTile) references disallowed object /Game/Creative/Items/Nature_Tiles/Meshes/S_Sand_Solid_Tri.S_Sand_Solid_Tri.. (FortValidator_FortExposedAssets)
 
 Projects/MyProject/Plugins/MyProject/Content/Props/Tiles/DesertTile.uasset (/MyProject/Props/Tiles/DesertTile) references disallowed object /Game/Environments/Apollo/Foliage/Broken_Trees/Meshes/Broken_Medium_BranchSet_01.Broken_Medium_BranchSet_01.. (FortValidator_FortExposedAssets)

 Projects/MyProject/Plugins/MyProject/Content/Props/Tiles/DesertTile.uasset (/MyProject/Props/Tiles/DesertTile) references disallowed object /Game/Environments/Apollo/Foliage/Desert/Meshes/SM_Desert_BarrelCactus_01.SM_Desert_BarrelCactus_01.. (FortValidator_FortExposedAssets)

 Projects/MyProject/Plugins/MyProject/Content/Props/Tiles/DesertTile.uasset (/MyProject/Props/Tiles/DesertTile) references disallowed object /Game/Environments/Props/Desert/Meshes/DES_Cactus_02.DES_Cactus_02.. (FortValidator_FortExposedAssets)

 Projects/MyProject/Plugins/MyProject/Content/Props/Tiles/DesertTile.uasset (/MyProject/Props/Tiles/DesertTile) references disallowed object /Game/Environments/Props/Desert/Meshes/DES_Cactus_05.DES_Cactus_05.. (FortValidator_FortExposedAssets)

Is this some kind of bug, or are these logs truthful, and somehow I’m not allowed to reference these objects. But then again, if that’s the case, situation is still problematic. Because if I’m not allowed to reference these objects, then I should not be able to reference them and waste hours of my time into something that won’t work.

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