Please check is your SD card getting detected in Finder Or File Explore, If yes then reset the Lightroom preferences.
Press the shift + option keys immediately after you restart Lightroom, and select Reset Preferences from the resulting dialog box.
mac or windows? What version?
What exact version of LR?
Are you using a card reader or directly connecting your camera?
Does the OS see your card or camera?
No, the card does not show in file explorer
I use Windows 8, LR 5.7, a card reader, and no the OS doesn't see it
If the OS does not see the card, LR can't because it relies on the OS for detecting drives.
Open disk management in the OS and check if you can see the SD card listed there. If it is listed, make sure it has a drive letter assigned. This usually all happens automatically.
Hurry up and update to Win10, it's free until the end of the month.
It isn't seen in disk management. If up update to Windows 10 will that solve this problem?
No one can guarantee that this will fix your system. However, something is wrong with your system or your card reader - try another card reader.
Regarding Win10: It's just my opinion, but, I never saw an OS worse than Win8. So, if I got the chance to update nothing would keep me
Is the card an SDXC and the card reader can only read SDHC cards? Maybe you need a new card reader, not a new OS.
How big is the SD card, what capacity?
Thanks all who responded. It wasn't LR but my OS that had the problem and I was able to correct it and now all is well......at least for now!
I have to agree about Windows 8....worse system ever!! It was on my new computer and I didn't realize how bad until I tried working with it. I have customized it to look like 7 for my own use but because 8 is so bad, I am hesitant to update to 10.