Using 'Render selected' with empty selection. Nothing will be rendered.
This message means that you are using the "render selected" feature, but you do not have any scene objects selected. In case of object ID - no objects with given ID; in case of include list - no objects added to the include list. In such cases, the scene will be rendered empty.
- In case of using Include/Exclude list, make sure some objects are added to the list
- In case of using Object ID mode, make sure there are some objects with given ID in your scene
- In case of using viewport selection mode, make sure you have desired object selected in viewport