SSLCertMonitor fails to initialise

Wished to test the new SSL certificate monitor but after a restart on ONMS it is throwing the following error in eventd.log:

2013-09-23 17:37:23,060 WARN [Main] PollerConfigFactory: start: Failed to create monitor org.opennms.netmgt.poller.monitors.SSLCertMonitor for service SSLCert
org.opennms.netmgt.config.ConfigObjectRetrievalFailureException: Illegal access trying to instantiate monitor for service SSLCert with class-name org.opennms.netmgt.poller.monitors.SSLCertMonitor; nested exception is java.lang.IllegalAccessException: Class org.opennms.netmgt.config.DefaultServiceMonitorLocator can not access a member of class org.opennms.netmgt.poller.monitors.SSLCertMonitor with modifiers ""
at org.opennms.netmgt.config.DefaultServiceMonitorLocator.getServiceMonitor(DefaultServiceMonitorLocator.java:79)
at org.opennms.netmgt.config.PollerConfigManager.initializeServiceMonitors(PollerConfigManager.java:981)
at org.opennms.netmgt.config.PollerConfigManager.setUpInternalData(PollerConfigManager.java:120)
at org.opennms.netmgt.config.PollerConfigManager.<init>(PollerConfigManager.java:101)
at org.opennms.netmgt.config.PollerConfigFactory.<init>(PollerConfigFactory.java:90)
at org.opennms.netmgt.config.PollerConfigFactory.init(PollerConfigFactory.java:126)

Any ideas on how to resolve ?