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The slider on the photo tray may not located properly. Remove any paper in the tray and if the slider is not firmly located to the bottom of the tray then slide it to the right where there is a 'cut-out' and locate the slider correctly. It will make sense when you remove the tray and examine the slider.
If the issue persists, please turn off the printer, unplug all its cables and wait for two minutes. Then, plugin the cables and restart the printer. Check if the issue persists.
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