2014-06-06 08:53:26,751 ERROR nolia.personalization.preview.filter.PreviewFilter: Can't get property 'visitor' from persona 'node /Sara-Byrne'
javax.jcr.ValueFormatException: property /Sara-Byrne/visitor is a multi-valued property, so it's values can only be retrieved as an array
	at org.apache.jackrabbit.core.PropertyImpl.internalGetValue(PropertyImpl.java:483)
	at org.apache.jackrabbit.core.PropertyImpl.getValue(PropertyImpl.java:510)
	at org.apache.jackrabbit.core.PropertyImpl.getString(PropertyImpl.java:520)
	at info.magnolia.jcr.wrapper.DelegatePropertyWrapper.getString(DelegatePropertyWrapper.java:161)
	at info.magnolia.jcr.wrapper.DelegatePropertyWrapper.getString(DelegatePropertyWrapper.java:161)
	at info.magnolia.jcr.wrapper.DelegatePropertyWrapper.getString(DelegatePropertyWrapper.java:161)
	at info.magnolia.personalization.preview.filter.PreviewFilter.getParameterFromPersona(PreviewFilter.java:126)
	at info.magnolia.personalization.preview.filter.PreviewFilter.doFilter(PreviewFilter.java:75)