Hi, I am new to processing and I am having some problems with PImage

for example, when i want to make 5 by 5 with chrome image,

I would code

PImage img;

void setup(){
  size(500, 500);
  img= loadImage("chrome.jpg");
}

//drawing the picture 5 by 5 using 'for'
void draw(){
  for(int x=0; x<= width; x+= 100){
   for (int y=0; y<= height; y+= 100){
    image(img, x, y,  100, 100);
   }
  }
}

.

And I saved "chrome.jpg' in this file, but it doesn't work..

The error sign says 'Prefix string too short'

What i want to know is the way to save the image properly that PImage would work.

Help Please~!! Thank you