Why do I get Host tried message when i try to download
 

When I try to download
the message comes after connecting
it says "Hosts tried___ (gives a number like 15 or something)
and then
goes on to the message
requires more sources
Please help me out and let me know why is this happening wehn i try download

You're obviously using the LW beta. That's good, it shows it's not just trying to connect to one host but as many as possible. If there's a lot of sources ... like over 100 or even 1000 then most likely they are fake. Try getting into the hbit of using bitzi to check it's a valid file; How to use Bitzi Web Lookup

More about fake files: Recognising fake files