Add a new field to the contact form

[midana]

I've followed this guide:  http://nemops.com/adding-new-fields-to-prestashop-contact-form/

 

 

And the new field shows up both on the website and in the mail. However what I write in the new field won't show up, instead it just says this in the mail:

 

Extrafield: {extrafield}

 

Anyone who knows why it doesn't show the real content instead of  {extrafield} ?