I'm trying to delete or modify a role in the Enterprise Manager > Core Application > Application Roles screen.
I'm EM 11g
Whenever I try to save changes, or to delete the role all together, I get an error 'The search for role Accounting failed'

Looking in the log, I have these messages which I believe are related:
| oracle.sysman.emas.model.security.AppRolesMainAdminBean object has been initialized successfully. | Notification |
| Could not find MBean operation "findDefaultRealm()" for MBean registered under "com.oracle.jps:type=JpsApplicationPolicyStore" and implemented by "class oracle.security.jps.mas.mgmt.jmx.policy.JpsApplicationPolicyStoreImpl" | Warning |
| Failed to get WLS users. | Error |
| Failed to get WLS users. | Notification |
| oracle.sysman.emas.pagemodel.security.AppRolesMainPageModel object has been initialized successfully. | Notification |