Render error

Hi, I am producing an animated short using UE 4.24, and I’m having really serious trouble with the rendering. Some weeks ago I was able to do it flawlessly, but now I am always getting the same error. In the images I’ve attached you can see step by step how the scene looks before rendering; the render settings; what the render screen shows (a full black screen) and how everything looks after this process. As you can see, the render as well as the project end up totally black. When I set the engine scalability settings to low (for the render I set it to Cinematics) this issue gets solved, but only partially, because a lot of objects (mostly parts of the characters) stay in a kind of “blinking” mode (they appear and disappear intermittently). What I’ve changed from the last time I was able to render properly is that I’ve added some lights, assets and animations to the scene.
All this makes it impossible for me to render. Any solution? Thanks a lot!