[Tails-dev] Echec de chargement de Tails après l'enregistrem…

Hi.
My name is Sami. I'm french and I'm living in Paris.
I tried to load Tails from an ISO image on a USB flash EMTEC.
My PC is a HP Pavilion dv6 Notebook.
I had the following message :

*No DEFAULT or UI configuration directive found !*
*boot :*

What should I do ? How can I fix it ?
Thanks for your help.
Sami.