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Here is a simpler version of the add(Object, int) method from Section 3.4.9. Under what circumstances will it fail? How do you fix this problem?

``` 1 public void add( E e, int p ) { 2 if (( p < 0 ) || ( p > length ) ) 3 throw new IndexOutOfBoundsException(); 4 SLNode newnode = new SLNode ( e, null ); 5 6 SLNode cursor = find( p – 1 ); 7 addAfter( cursor, newnode ); 8 length++; 9 } ```