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Strange mobility warning with InstancedStaticMesh

I am creating several InstancedStaticMeshes at runtime like this:

 for (const auto& StaticMesh : StaticMeshes)
         UInstancedStaticMeshComponent* StaticMeshComponent = NewObject<UInstancedStaticMeshComponent>(this);
         // Add to array

And later use them to create instances like this:

 // Pick a random mesh
 const int32 Num = InstancedStaticMeshComponents.Num();
 if (Num == 0)

 UInstancedStaticMeshComponent* InstancedStaticMeshComponent = InstancedStaticMeshComponents[FMath::RandRange(0, Num - 1)];
 if (InstancedStaticMeshComponent == nullptr)
 // Calculate a transform
 FTransform Transform = SocketedMeshComponent->GetSocketTransform(SocketName);
 // Create the mesh

When I do this, I get the following warning:

Warning Mobility of BP_InstanceMaker_C_1411 : Root Component has to be 'Movable' if you'd like to Mobility of {0} : {1} has to be 'Movable' if you'd like to {2}. .

The root scene component of the Actor these components are on is set to static, as well as each UInstancedStaticMeshComponent I create. It's a strange error, because it looks like it should be parameterized (not the {0}, {1} and {2}) but isn't. Any ideas?

Product Version: UE 4.10
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asked Dec 15 '15 at 11:28 PM in C++ Programming

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