What is your version of Lightroom? This camera requires at least 2015.1.
If you have trouble updating using the CC desktop app or Help > Updates, you can update from here: (the latest version is 2015.8)
If that isn't the problem, please describe in detail what happens when you try to import, and quote any error messages in full.
Please state the following information
- The exact version NUMBER of your Lightroom. Do not say words like "up-to-date" or "recent".
- Exactly what happens when you try to Import these NEF files? Describe in detail or show us a screen capture. If there is an error message, please quote the exact complete unedited word-for-word error message.
Could you specify what version of Lightroom CC you are using. Your camera model is supported by Adobe Camera Raw 9.1 and Lightroom CC 2015.1
The Latest version for Lightroom is LR CC 2015.8 and can/should update to that version.