ActiveRoles Server failed to add a member to a certain Dynamic Group.
Most likely cause:
The domain controller rejected the request to add the object to the group. In the event description, the object and the group are identified by the "Object" field and "Dynamic Group" field, respectively. A symptom of this condition is the "The directory is busy" or "The server is not operational" error message in the "Details" field of the event description.
What you can try:
Update the membership of the dynamic group by clicking "Rebuild" on the "Members" tab in the "Properties" dialog box for that group, in the ActiveRoles console.
Alternatively, you might update the membership of all dynamic groups by using the ActiveRoles console to execute the "Dynamic Group Updater" task located in the "Configuration/Server Configuration/Scheduled Tasks/Builtin" container.