Description:
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We're trying to use: newt_checkbox_tree_add_item()

We pass it 5 params as indicated in the docs (and as the source indicates is 
required), but that gives an error:

 newt_checkbox_tree_add_item() expects exactly 4 parameters, 5 given

So we drop it to 4 params, and as you'd expect, it gives:

 Wrong parameter count for newt_checkbox_tree_add_item()