Revit rendering is blank

[Anonymous]

I think something has gone wrong with my Revit file as when i try to render the image that comes up is either 1-blank white or 2-just sky and default ground plane.

When i send the rendering to the cloud i get an error that says the rendering failed. 

The file works fine and in any of the views (hidden line, realistic etc) the image looks great.  Its just when i hit render if goes through the rendering process where it works square by square but it doesn't render my building.

If i copy elements out into a new file, they render fine.  But i can't seem to copy my entire project out into a new file (it always says it cannot copy all the elements).

Any suggestions on what the issue is or how to fix it?

Thanks!!!

[constantin.stroescu]

Could be an exposure cause...but not sure because you said the  sky appear....If the cause is from exposure, only the Color and Image Background appears...

Try, in your rendered blank to : Adjust Exposure> Exposure Control>Settings>Exposure Value>move the slider to right to 14-15....If this is the cause,then the rendered image will appear...

[Anonymous]

Its definitely not the exposure.  I can adjust that and it doesnt affect it.  Its like the rendering engine cannot see the model.