psx2psp trouble

hi to all hoping someone can help me :thumbup: here is my problem. i am trying to convert my ps1 game to play on my psp, i have read a guide which tells me to use isobuster and psx2psp v1.2. first i use isobuster to extract the cd, i have tried several different ways to extract the files and get two files, but no file named bin as i read i need to ad .iso at the end of it, however i get to the psx2psp menu using it in theme mode which is v 1.4.2 and i fill in all the gaps correct as i read to, but when i press the convert button it gives me an error saying that it cant open the pbp file to which point i am now lost and tried all i can think to try. so i hpoe i have explained the problem ok and hope someone can help me thank you very much for any help :)