how do you play Famicom Disc System on FCE Ultra GX?

i have FCE Ultra GX 3.0.1
it did what its says to do, find the bios then name them, then i go to them, select it, it load, but then it says :

nintendo
battery err.02

i pressed A on the wii con, but nothing happened so how,do you play Famicom Disc System on FCE Ultra GX 3.0.1

the game in question is super mario bros 2



Edited 1 time(s). Last edit at 04/27/2009 10:19PM by lizard81288.