This error message indicates your NTP server is out of sync from your root NTP server by at least 5 seconds. This results in the Airtame failing to synchronize because it thinks the NTP server's time is bad.
The root distance is defined as:
The root distance statistic is computed as one-half the root delay of the primary source of time; i.e., the reference clock, plus the root dispersion of that source. The root variables are included in the NTP packet header received from each source. At each update, the root delay is recomputed as the sum of the root delay in the packet plus the peer delay, while the root dispersion is recomputed as the sum of the root dispersion in the packet plus the peer dispersion.
To address the issue check the time on the NTP server and make sure it is synchronized properly and accurately. If the root distance is correct, the issue may be related to root dispersion. If root dispersion is larger than 5 seconds, this will also cause NTP sync issues.