Rendering will abort as soon as an error is detected. This is the recommended setting. In general, you should not ignore important error messages, or you'll risk crashes, rendering artifacts and undefined behavior.
If set, rendering will stop if the license is not detected when the render begins.
Switch this on to avoid taking an Arnold license from the license server. This will always render your image with a watermark.
The color to display if there is an error reading a texture or it doesn't exist.
The color to display if the pixel returned to the render is a NaN (Not a Number).
The color to display if there is a problem with the assigned shader or no shader is assigned.