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Check all settings on the computer or other device you are printing from, in both the program's print settings, and in the driver settings on the computer for that printer.
The print settings are probably directing you to a paper source or paper tray or feed tray etc., that is not loaded with paper. Thus a 'paper out' signal. But it is not referencing every paper tray, or the one you loaded with paper - it is referencing the paper tray the software is trying to direct the print job toward.