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OfficeJet Pro 7740 thinks tray 1 is empty but it isn't - it has 11x17. won't print

HP Recommended
OfficeJet Pro 7740 Wide Format All-in-One
macOS 10.14 Mojave

I previously had printed onto tabloid with no problem.


Now the printer won't print.  Says:

Load Plain Paper

(Tabloid 11x17)

paper in tray 1

confirm guides are in


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I put 11x17 in tray 2 and was able to print.

I put letter size in tray 1 and the printer still thinks the tray is empty.

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