Problem with installation Debian 9

"eamanu15 ." <[email protected]>
Newsgroups gmane.linux.debian.user.laptop
Message-ID <CACttXDMKUM8RAy9mqAitS4=Vjj8ZXRdNSxcnE0kZaCW9+6-MkA@mail.gmail.com> 
Hello,

I am trying to install Debian 9 (debian-9.2.1-amd64.netinst.iso) using USB
booting method.

My laptop is  a Samsung RV420 - Core i5 - 4GB RAM - 640GB HDD

The installer detect my two network card (ethernet and wireless). I use the
wireless card.

I complete the ESSID and password for the wireless network. But (after
complete the password) the installer give the error:

Attempting to find an available wireless network Failed.

What could be the problem?

Regard!
eamanu
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