Cannot delete all audit logs

When attempting to delete all the audit logs from the system, a failure occur and the message "Failed to delete all audit logs" is present.

Reproduction Steps

• Login as admin
• Open Audit Logs admin/viewGlobalAuditLog.action
• See logs
• Click "Delete all" audit log button
• Confirm delete operation in popup
• Expected: all logs are removed
• Actual: message "Failed to delete all audit logs" is present

The following is logged:

 2015-02-27 12:44:34,392 ERROR [qtp785705372-181] [ViewGlobalAuditLogAction] org.springframework.orm.hibernate3.HibernateSystemException: Unknown entity: java.lang.String; nested exception is org.hibernate.MappingException: Unknown entity: java.lang.String
2015-02-27 12:44:34,393 ERROR [qtp785705372-181] [BambooActionSupport] Failed to delete all audit logs