Thanks, hopefully now someone else can give a look at the code.
The problem comes from the code:

    if (treeNode.getParent() != null) {
            throw new IllegalArgumentException("treeNode already has a
parent.");
        }

in TreeBranch.java. I can't understand why treeNode must have null parent to
be updated.



Duto wrote:
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> If I can help :)
> 
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