You may use only Adjustment Layers (or their equivalent). An Adjustment Layer is a special type of layer containing no image data that lets you experiment with color and tonal adjustments without permanently modifying the pixels. Adjustment Layers must be applied in Normal mode.
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Unfortunately, while the sharpening step was applied in Normal Mode, your image also included an illegal Background Copy layer. In Basic Editing, we can only use straight Adjustment Layers (ones that don't contain pixel data).
We're so sorry, but the image has to be disqualified.