I can't save my project because of a private object

I tried harvesting and making into a blueprint a structure that I exported from sketchup using datasmith , but when i do this , if the blueprint is in use in the project , it giver me the following error : Can’t save E:/Projetos Unreal/ParkMadeiraPlastico/Saved/Autosaves/Game/Main_Auto2.umap: Graph is linked to external private object DatasmithActorTemplate /Game/rampa/Slalon.Slalon_C:Component_1_42_StaticMeshComponent0_GEN_VARIABLE.DatasmithAssetUserData_0.DatasmithActorTemplate_3198 (ObjectTemplates)

any ideas how to fix?