Caused by: java.lang.NullPointerException
at org.apache.tapestry5.dom.Element$1.accept(Element.java:496)
at org.apache.tapestry5.dom.Element$1.accept(Element.java:492)
at org.apache.tapestry5.dom.Element.getElement(Element.java:519)
at org.apache.tapestry5.dom.Element.getElementByAttributeValue(Element.java:491)
at org.apache.tapestry5.dom.Element.getElementById(Element.java:473)
at org.apache.tapestry5.dom.Document.getElementById(Document.java:204)
at org.apache.tapestry5.corelib.components.Label.advised$updateAttributes_496224c3170(Label.java:121)
at org.apache.tapestry5.corelib.components.Label$Invocation_updateAttributes_496224c316f.proceedToAdvisedMethod(Unknown Source)