4.12.2
I have sub levels to my persistent level. The only static meshes that gave me the external error were the ones on the persistent level. I have a sub level for the infrastructure. Once I moved the items giving the error to the sub level AND did the renaming project thing, the errors are gone.
Yet…I still get the pop up box saying there is still a problem, yet nothing on the map check of the Message Log tab. Tried making each level current and saving. Exited the Editor. Still get the message box once, but nothing shows in the map check.