error: Exception occurred4 from ReadData() at Open_interest.ReadData(String htmlText)Exception occurred step 6 from ReadChainData() at System.String.Substring(Int32 startIndex, Int32 length) at Open_interest.ReadChainData(String chainData)

hi friends,
i uploaded a website to godaddy.in , which  is working very fine and fetching data and what it is made for in my local system
but after upload to godaddy, it's opening , login is ok but when it's trying to fetching ( parsing data) data from other website, it's giving the error:
Exception occurred4 from ReadData() at Open_interest.ReadData(String htmlText)Exception occurred step 6 from ReadChainData() at System.String.Substring(Int32 startIndex, Int32 length) at Open_interest.ReadChainData(String chainData)
pls find the screen shot of that error:
http://postimg.org/image/3l9lddmqn/
[url=http://postimg.org/image/3l9lddmqn/][img]http://s11.postimg.org/3l9lddmqn/error_forum.jpg[/img][/url]
pls let me know the  solution what i need to do to solve this error;
thank you