On the Output tab of the Preset Options dialog box, you selected the Auto name based on first words on page check box to automatically generate file names for newly scanned documents. This option uses the first few characters of recognized text in the document as the basis for the file name, and therefore requires that optical character recognition (OCR) be performed first.
You must either select a different file naming option on the Output tab of the Preset Options dialog box, or click OK when you see this message, to automatically activate the Use OCR to recognize the text of the scanned image option (on the Processing tab) for the current preset.