What version of Lightroom? You need Lightroom 5.4 or later.
Lightroom. CC.. I was told that was the most recent.
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Please quote the exact complete unedited word-for-word error message.
Also go to the menus and select Help->About Adobe Photoshop Lightroom and state the exact version of Lightroom.
If you're trying to send a screenshot of the error and/or LR version, you can't via e-mail. To add a screenshot to a forum message, you need to use the web version of the forums that is linked in each e-mail notification with the link that says "View the full discussion".
You need to copy the raw images straight from Camera Card(SD Card) to your computer and try import in Lightroom, I hope you are not using any Nikon software (ViewNX) to transferring the Images to your computer.
Because some times, if the camera software not updated, it re-writes the Metadata for Raw Images.