随机回应mockaroo中的错误

Question

如何在mockaroo.com中随机生成错误？下面这样的东西不起作用（总是收到401）

if random(0, 2) > 1 then
  status 500
  { message: 'I was told to error' }
else 
  schema "Todos"
  generate 10  
end