… it is a known issue with REVIT 2019 when you are in an uncropped 3d view
… first you need to update your program to the latest 2019 release update
… the 2019.0.1 hotfix will fix the amount of GB

..... hotfix 2019.2.1
http://up.autodesk.com/2019/RVT/9CA05B9A-1908-0510-A1B4-FFF7A680FE55/Autodesk_Revit_2019_2_1.exe
…. Or you can go back to your cropped view
… then you will be able to render it
… ckeck as well that your camera isn’t inside of a wall or element… that can cause a black screen
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REVIT EXPERT ELITE
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