import java.util.ArrayList;

/**

* This class keeps a set of unique strings, and lets the user

* ask the total length of all Strings in the store.

*

*

*

*/

public class StrCharCounter {

private ArrayList store = new ArrayList<>();

private int size = 0;

public boolean add(String sToAdd) {

size++;

if (!store.contains(sToAdd))

return store.add(sToAdd);

else

return false;

}

public int calcTotalLength() {

int cnt = 0;

for (int i = 0; i < size; i++) {

cnt += store.get(i).length();

}

return cnt;

}

}

provide a screenshot using the debugger of the IDE of your choice showing all appropriate local and instance variables JUST BEFORE THE EXCEPTION.

identify the error, and how to fix it.