Error Msg seen on the WLC Wism2

[high-power]

 *haSSOServiceTask7: Sep 16 09:48:31.215: %APF_HA-6-CLIENT_DB_FIND_ERR: [PA]apf_ha.c:367 Unable to find Mobile 16:61:51:17:63:3f entry in the database, could not process send update message for Mobile

Wism 2 running Software Version : 8.2.131.10

We have lot of such Messages in the Show traplog.

what does the message mean and how can you avoid it?

Thanks in advance.

[outsider555]

*haSSOServiceTask5: Mar 28 14:38:10.651: %APF_HA-6-CLIENT_DB_FIND_ERR: [PA]apf_ha.c:362 Unable to find Mobile  entry in the database, could not process send update message for Mobile

WLC5508 8.0.140.0