Issue Saving Project when using Lens File

I have a project with a scene that contains a actor which has a cinecam component and a lens component.

When I have a lens file selected in the lens component, I am unable to save the project and get the following error.

Does anyone know why?

The asset ‘/Game/ExternalActors/ThirdPerson/Maps/ThirdPersonMap/9/6Q/POL9ENBHJKNPP2EJJRUK8Q’ (POL9ENBHJKNPP2EJJRUK8Q.uasset) failed to save.

Cancel: Stop saving all assets and return to the editor.
Retry: Attempt to save the asset again.
Continue: Skip saving this asset only.