#3 IndexHTML Error in file: HTMLParser.cs

[Anonymous]

when I run IndexHTML it have Error in below

caught a System.NullReferenceExcption
with message: Object reference not set to an instance
of an object

I think it error in class HTMLParser (file:
HTML\HTMLParser.cs) on line 107

pipeInStream = null;
pipeOutStream = new System.IO.StreamWriter
(pipeInStream.BaseStream);