You don't need to add 'ui input' classes to input with error, since it's...

... already .field inside a .ui.form

When you do that, here's what happens:

before error:

![image](https://cloud.githubusercontent.com/assets/44672/5358379/b6b341fc-7fc4-11e4-9808-730b90ebe9c9.png)

after error:

![image](https://cloud.githubusercontent.com/assets/44672/5358390/c6369d86-7fc4-11e4-8264-be581a24981f.png)