Oracle SQLFiddle - Building schema Error

Question

First time using SQLFiddle. I want to test Oracle sql. So on left panel, I paste this code which I got here

create table Employee(
  name varchar2(100),
  id integer, 
  salary integer,
  PRIMARY KEY(id)
);

This successfully executed. But when I change 1 of the column, I got script error:

create table Employee(
  sssssss varchar2(100),
  id integer, 
  salary integer,
  PRIMARY KEY(id)
);

Why? Can't I create any column name?