The error is that you do not have a license for the lte_toolbox. You need to do one of the following:
If you do have a license:
- Talk to your system administrator and get your license server working again
- Make sure the license is not expired
- Make sure the license is not in use by another person (or another session of yours)
If you do not own a license:
- Buy a license for the LTE toolbox
- Stop using blocks from the LTE toolbox in your model
