I have below code and it fails on line 
le.Current = lc.GetEntity(para); 
because lc.GetEntity(para) gets NULL value and it says parameter value can’t be null. 
Could you please guide what is causing this to fail? 
priva…... le, LayoutCollector lc, Paragraph para) { var sib = para.NextSibling;...the para variable is not a Paragraph node, as the GetEntity method...