When I am executing the script, it fails with the following error in the console.
RFCP0050E: No screen point found for object.
But when I check the application in debug mode, object seems to be visible.
Do you have any idea about this.

And also, how can we click on a tree object ? I am using following code which throws java null pointer exception.
TestObject[] links = inv.getHtml_treeContainer().find(atDesendent(".cla ss","Html.DIV"));
Where getHtml_treeContainer() is table(tree) object.