Do you receive any error at the time of import?
Could you mention camera make and model number?
If possible, share a screenshot of your Lightroom import window for better assistance.
We need more information than that.
In fact - any information would help.
Mac or Windows?
What exact version of the OS?
What exact version of Lightroom? (See the about dialog)
Which camera model?
Raw or JPG files?
Using a card reader (recommended) or connecting the camera to the computer?
What is the exact text of the error messages you are getting?
At what point in the import process do you get an error or other undesired behavior from Lightroom?