Default Property warnings and errors

All of a sudden getting this warning when starting UE 4.9:
Default Property warnings and errors:
Error: CDO Constructor (LeapMotionImageComponent): Failed to find /Engine/BasicShapes/Cube
Error: CDO Constructor (LeapMotionImageComponent): Failed to find /Engine/BasicShapes/Cube

Tried disabeling / enabeling LeapMotion plugin, but no joy.

Getting the same warning in compiled project on Windows.

Take a look inside the .uproject file itself, you will probably see a reference to the plugin and even though the plugin might be disabled in the file it sometimes causes the error you have.
The easiest thing to do to get rid of the error is to remove the plugin reference from the .uproject file (use something like notepad++ to edit the json).