License exception

Hi! Recently I get the LicenseNotAcquiredException: Nuitrack Exception(Exception type 6),is this because i used a new sensor?
But i thought nuitrack pro online has no limitation on linking to a sensor or do i get anything wrong about the description.

The online license is linked to the serial number of the sensor.
To use an online license with a new sensor, you need to reactivate Nuitrack with a new sensor using the same license key.