So does it do a single sided copy fine?
If so, check what the paper does through the paper path of the ADF. In other words, if you select duplex, but the df just feeds the paper in the top and out the bottom of the df, then your juction gate and/or solinoid, is stuck. The error will result, as the machine is expecting the duplex sensor to trigger and not the document exit sensor.
Do an output check on the duplex gate on the df (in output check, option 6 in the sp mode). If it does not actuate, you know where your problem is....
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