oonowind

Hello, everyone...i am a newbie of emulator, and i am experiencing a problem when I play the DC emulaor Chankast v2.0a. i have already downloaded the chancast with 2 bios, and it is working well with game Ikira, but when I tried to play other games, it appeared this message "ioControl error" Can you guys tell me why this happens? and is there anything i can do to solve this problem? Thanks a lot OoNoWinD