My lightroom is not reading cards from my D5300.
What version number of Lightroom do you have?
Nikon D5300 needs v5.3 or higher.
Cameras supported by Camera Raw
How do you connect cards to download? Camera+usb cable, Card reader?
What exact error message do you see?
What is the destination for the files from the card?
A "Not Reading" error message usually indicates that the DESTINATION for the files you are downloading does not have "Write" permissions, or is not available for some other reason.
Retrieving data ...