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That's not an Arnold message, and I don't see any render happening. When does this error happen? What else is logged in the script history?
What version of MtoA?
What are your color management settings? The defaults? Or something else?
I just clicked on 'render' under the Arnold tab and got the message. I'm new with maya and arnold so I don't know what the color management/default settings should be. Maybe I unknowingly chnaged something.
Any help would be appreciated!