When routing a family tree you may receive the Wrong Graph Structure Error.
To understand why this is unhelpful imagine creating a family tree like this:
Help > Example Graphs > Layout > familytree.graphmlz
Then try routing the example.
Layout > Family Tree
That will generate the error if you have previously chosen any colours in the routing dialogue that differ from the colours in the example. It is especially unhelpful as it suggests that a good example is the graph it has just failed to route.
The easiest way to fix this is to explain that the colours in the dialogue need to correspond to the graph.
