'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil' - ios

Question

I have an array with the names of the images in the form of strings, I want to transform it into an array of images and I getting this error, what I did wrong?
'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
My code:
NSString * immagini = self.chinaTable.images; //unique string
NSArray * arrayImages = [immagini componentsSeparatedByString:#";"];
NSLog(#"The images: %#", arrayImages);// here are strings
/*The images: (
"ArchUrb_PortaGenova1.jpg",
"ArchUrb_PortaGenova2.jpg",
"ArchUrb_PortaGenova3.jpg",
"ArchUrb_PortaGenova4.jpg"
)*/
NSMutableArray * mutableImages =[[NSMutableArray alloc]initWithCapacity:20];
for (id obj in arrayImages){
/*The images: (
"ArchUrb_PortaGenova1.jpg",
"ArchUrb_PortaGenova2.jpg",
"ArchUrb_PortaGenova3.jpg",
"ArchUrb_PortaGenova4.jpg"
)*/
[mutableImages addObject:[UIImage imageNamed:obj]];//here comes the error
NSLog(#"The array mutable is è %#", mutableImages);
}
NSLog(#"The array of images %#", mutableImages);
self.viewImages.animationImages = [NSArray arrayWithArray:mutableImages];
self.viewImages.animationDuration =3;
self.viewImages.animationRepeatCount= 0;
[self.viewImages startAnimating];

Answer 1

[UIImage imageNamed:] returns nil if it can't find the requested image in your app bundle.
Add missing image to your project, or add an if before adding image to array, like this:
for (id obj in arrayImages){
UIImage *image = [UIImage imageNamed:obj];
if (image != nil)
{
[mutableImages addObject:image];
}
NSLog(#"The array mutable is è %#", mutableImages);
}

Answer 2

Change your code segment as follows
for (id obj in arrayImages){
UIImage *image = [UIImage imageNamed:obj];
if ( image ) {
[mutableImages addObject:image];
NSLog(#"The array mutable is è %#", mutableImages);
}
}

Answer 3

This question is related to the question: Exception with insertObject:atIndex: on iOS6. So please read it to find your solution.