--- Operating System, Graphics card ---
Windows 7 , gtx 580

--- Blender version with error, and version that worked ---
Never worked... All blender versions

--- Short description of error ---
I am wanting to set up a custom multilayer EXR output with the file output node... However, when i delete the composite output node (as i dont need these extra files) it wont allow me to render.

--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
Step 1: load up attached blend file
Step 2: try to render