You get this error cause you have enabled the Staged injection feature, but not activated any outputs as secondary injectors in outputs --> Output config.
Staged injection is enabled.
No Secondary injector activated on any output, which means staging will not work <-- tune problem.
How to fix
If you want the staging feature, you better heading over to the Staged injection help section, and read how to properly activate this feature and how to setup to suit your need.
