Yeah, a few lines above that in the log I get this:
017.07.03-03.30.08:923][ 0]LogWindows:Error: === Critical error: ===
[2017.07.03-03.30.08:923][ 0]LogWindows:Error:
[2017.07.03-03.30.08:924][ 0]LogWindows:Error: Fatal error: [File:D:\Build++UE4+Release-4.16+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 3615]
[2017.07.03-03.30.08:924][ 0]LogWindows:Error: Default subobject SphereComponent RootComponent already exists for Ship_Base /Script/Invert.Default__Ship_Base.