Probably the example that you have found in wiki were not update to the latest API.
If you use and IDE (like NetBeans or Eclipse), you can use them to solve these problems easily...
You have to do what the error says. Add this at the end:
@Override
public IRenkoBar getInProgressBar() {
// TODO Auto-generated method stub
return null;
}
// This is the new code!
@Override
public double getWickPrice() {
return 0;
}
and probably this will solve the compile error. But if you need to really implement the getWickPrice() method, then wait for Support to help out.