code: public ClassDoc[] errors() {
          ListBuffer<ClassDocImpl> ret = new ListBuffer<>();
          for (ClassDocImpl c : getClasses(true)) {
              if (c.isError()) {
                  ret.append(c);
              }
          }
          return ret.toArray(new ClassDocImpl[ret.length()]);
      }
docs: Get Error classes in this package.
  
  @return included Errors in this package.