Got some error in syslog

My office using Stellar on express mode and have some labtop and smartphone got problem when tried to connect with stellar and then I have checked syslog I got error below.

[dcm] auth: Client cc:25:ef:42:0e:e8 tries to connect 2.4G radio, the vap is ath01, disallowed by DCM, Deny count 2. err 192.168.2.11 [dcm] auth: Client fc:f8:ae:5b:f9:b4 tries to connect 2.4G radio, the vap is ath01, disallowed by DCM, Deny count 2. err 192.168.2.11 [dcm] auth: Client fc:f8:ae:5b:f9:b4 tries to connect 2.4G radio, the vap is ath01, disallowed by DCM, Deny count 1. err 192.168.2.11

So can someone help me about this problem.

thank you.