error after add master server to opscenter server

Hi

I have the error after add master server to ops center server and ops center cannot get information about the master server

Master version 7.6.1

Ops center version 7.6.1

"Action not permitted. Please verify that the OpsCenter host is listed in NetBackup configuration file (host properties or bp.conf) and/or trust is established in case of NBAC.​"

Thank you

damrongpol s.