FOP NullPointerException !!!

[Dang Minh Phuong <mp...@ncs.com.sg>]

Hi all, 

Suddenly, I hit this problem:

java.lang.NullPointerException
	at
org.apache.fop.render.pdf.fonts.LazyFont.getAscender(LazyFont.java:127)
	at org.apache.fop.layout.FontState.getAscender(FontState.java:143)
	at org.apache.fop.layout.LineArea.(LineArea.java:326)
	at
org.apache.fop.layout.BlockArea.getCurrentLineArea(BlockArea.java:164)
	at org.apache.fop.fo.flow.Leader.addLeader(Leader.java:229)
	at org.apache.fop.fo.flow.Leader.layout(Leader.java:201)
	at org.apache.fop.fo.flow.Block.layout(Block.java:257)
	at org.apache.fop.fo.flow.AbstractFlow.layout(AbstractFlow.java:154)
	at org.apache.fop.fo.flow.AbstractFlow.layout(AbstractFlow.java:110)
	at
org.apache.fop.fo.pagination.PageSequence.makePage(PageSequence.java:400)
	at
org.apache.fop.fo.pagination.PageSequence.format(PageSequence.java:338)
	at
org.apache.fop.apps.StreamRenderer.render(StreamRenderer.java:262)
	at
org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:223)
	at
org.apache.xalan.transformer.ResultTreeHandler.endElement(ResultTreeHandler.
java:309)
	at
org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:
716)
	at
org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApp
lyTemplates.java:425)
	at
org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.jav
a:216)
	at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Transform
erImpl.java:2339)
	at
org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(Transformer
Impl.java:2160)
	at
org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.j
ava:1213)
	at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:
668)
	at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:
1129)
	at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:
1107)

Could anyone tell me what is going on? Whether I miss out something???
(configuration, ... etc.)

Thanks

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