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HP LaserJet Pro MFP M428fdw
macOS 10.15 Catalina

I have HP428 fdw laser printer, and use with my macmini.  I have been used the printer for a few years.  But recently I could not print.  I did not do anything.   After I send the file, the printer showed "Load A4 paper...) message.  I took the paper trey out and check everything,  All look ok.   I even took some paper or add some paper.   Whatever, when I send the file, the printer seems not recognize there is paper there.  Any helps?  Thanks. 

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