"Plz insert a playstation 2 format disk" error on pcsx2-0.9.8 r4600

I was trying to play Tekken 6 on a pcsx2-0.9.8 emulator. After doing all settings I am stuck on the screen saying "Plz insert a Play Station 2 format disk ". I googled about it and came to know that this error comes when u try to play a disk which is not supported by playstation 2. I downloaded tekken 6 from torrent site (<remmoved>). Plz tell me its the right iso file I have downloaded and how to play it.

This is first time I am trying to play psp games to my laptop.