playing with madcatz gamepad wont work on nestopia

[firco]

just got this controller before I was using a different gamepad and when I open a nes game it says one or more joystick device IDs were not recognized. do you want to remap the affected keys to the new devices I click yes and i hear music playing but no game does the same when i say no

is there a way to fix this it works fine with snes genesis