iphone - スイッチ内の 1 つの配列にオブジェクトを追加する際の EXC_BAD_ACCESS

Question

それが私のコードです

int indiceCorrente=0; int difference=delegate.reader.feedItems.count;

while(variable!=0){
switch(variable){

case 1: ----
case 2: ----


default: { 

                NSMutableIndexSet *add=[[[NSMutableIndexSet alloc]init] autorelease];
                [add addIndex:indiceCorrente];
                [add addIndex:indiceCorrente+1];
                [add addIndex:indiceCorrente+2];
                [self aggiungiElementoArrayLettura:add];





                //[page addObject:@"makeLayout3"];
                NSMutableArray *pagina=[[NSMutableArray alloc]init];

                indiceCorrente=indiceCorrente+1;
                [pagina addObject:indiceCorrente]; <------ EXC_BAD_ACCESS WHY????
                indiceCorrente=indiceCorrente+1;
                [pagina addObject:indiceCorrente];
                indiceCorrente=indiceCorrente+1;
                [pagina addObject:indiceCorrente];


                [pages addObject:pagina];

            }
}
}