Caused by: java.lang.ArithmeticException: divide by zero on Main Activity

So i am trying to run an android application on my device, however i am getting the same run time error every time java.lang.ArithmeticException: divide by zero so my application starts and closes immediately.

In the log says that is Caused by: java.lang.ArithmeticException: divide by zero. Accordingly i am going to present you what the code is in those three lines.

 1.**at com.daimajia.slider.library.SliderLayout.setCurrentPosition(SliderLayout.java:664)
   2. at com.daimajia.slider.library.SliderLayout.setCurrentPosition(SliderLayout.java:670)
    3.at com.example.testapp.MainActivity.onCreate(MainActivity.java:53)**

1. public void setCurrentPosition(int position, boolean smooth) {
   if (getRealAdapter() == null)
   throw new IllegalStateException("You did not set a slider adapter");
   if(position >= getRealAdapter().getCount()){
   throw new IllegalStateException("Item position is not exist");
   }
   int p = mViewPager.getCurrentItem() % getRealAdapter().getCount();
   int n = (position – p) + mViewPager.getCurrentItem();
   mViewPager.setCurrentItem(n, smooth);
   }

2.

 public void setCurrentPosition(int position) {
            **setCurrentPosition(position, true);**
        }




3. 

mainSlider = (SliderLayout) findViewById(R.id.main_slider);
        setSlider();
        PagerIndicator pagerIndicator = (PagerIndicator) findViewById(R.id.custom_indicator);
        mainSlider.setCustomIndicator(pagerIndicator);
        mainSlider.setDuration(3);
        **mainSlider.setCurrentPosition(app.heritageSites.size() - 1);**

The lines which have the asterisks are those one’s who have the problem.

try {
     mainSlider.setCurrentPosition(app.heritageSites.size() - 1);
  } catch (ArithmeticException e) {
     e.printStackTrace();
  }