"Cannot be Read" - this is the most cryptic error message in Lightroom!
It often means you Cannot WRITE the images to your chosen destination.
Check your destination options in the Import dialog, and then check the Read/Write permissions on the destination folders.
Compatability of Camera model with Lightroom version is also necessary for raw images. Cameras supported by Adobe Camera Raw
An informative video at:
If you are a Mac user, info about Permissions here- Troubleshooting permissions issues in Mac OS X - Apple Support
This usually means that the destination (folder) for your imports does not have full read/write permissions on the drive. Check the permission resetting them, if they already say read/write changing them and back again, sometimes works too! Good luck
do you have your CF card inserted in a card reader or the camera. If you have connected your camera, try to put the cf card in an card reader an try again.
The next try can be to copy all pictures to hard drive and then import to LR
Regards from Germany
Do you have done what I wrote?