Unable to parse OGNL expression

[Borut Bolčina]

I am trying to use Tacos 4.1 Tree component. I generated a skeleton 
project with Tapestry 4 Maven archetype and copied SimpleTree files from 
Tacos 4.0.1 sources. Any quick hints on the following error:

Unable to parse OGNL expression 'offsetAttribute + ': ' + 
(((contentProvider.hasChildren(value) ? 0 : 1) + treeIterator.depth) * 
offset) + 'px;'': Error compiling expression on object 
[EMAIL PROTECTED]/tree] with expression node offsetAttribute + 
": " + (((contentProvider.hasChildren(value) ? 0 : 1) + 
treeIterator.depth) * offset) + "px;" getter body: { return ($w) 
((($Tree_8)$2).getOffsetAttribute() + ": " + 
ognl.OgnlOps.booleanValue(((net.sf.tacos.model.ITreeContentProvider)(($Tree_8)$2).getContentProvider()).hasChildren((($Tree_8)$2).getValue())) 
? 0 : 1 + .getTreeIterator().getDepth() * (($Tree_8)$2).getOffset() + 
"px;");} setter body: null


syntax error near "0 : 1 + .getTreeIter"

Here are the dependencies
http://flickr.com/photo_zoom.gne?id=426708374&size=o

And some code:
### SimpleTree.html ###
<div jwcid="tree" id="tree" style="overflow: auto; width: auto; height: 
auto;">
   <span jwcid="@Insert" value="ognl:item.name"/>
</div>

### SimpleTree.page ###
   <property name="item" />
  
   <component id="tree" type="tacos:Tree">
       <binding name="contentProvider" value="new 
com.acme.simpletree.SimpleTreeContentProvider()"/>
       <binding name="value" value="item"/>
       <binding name="nodeLinkAjax" value="ognl:false" />
   </component>

### SimpleTreeContentProvider.java ###
### Folder.java ###
### Item.java ###
All three copied from Tacos-demo 4.0.1 sources.


Thanks,
Borut

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