LSU refers to the long strip of glass / encoder strip inside the top of the cartridge compartment. It could be dirty or dislodged.
Power off the printer
Open the front cover
Lightly pull out the cartridge and keep it flat
Gently swab the LSU. If part of the LSU is hanging, gently put it back in place and reconnect. Be careful not to touch anything else.
Note: If you are unable to reconnect the LSU, the printer will need service.
Put the cartridge back (again, leave it flat).
Close the front cover.
Power the printer back on.
Hope this helps.
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