iTunes on my 2015 MacBook Air is not recognising my iPod Classic 160gb.

I deleted some tracks from iTunes on my 2015 MacBook Air running macOS High Sierra v 10.13.6 and when I tried to update my iPod Classic 160gb, iTunes does not recognize the iPod.

I have been doing this regularly (every couple of days) over the past few weeks as I attempt to clean out unwanted tracks and there has been no problem until today. Any suggestions or help would be greatly appreciated.

Allan