This is disheartening but it seems there is nothing can be done about it. Whatsapp crash out Blackberry and some other deviced out of Whatsapp supported phone list.

Whatsapp mobile app to stop working on Blackberry, Nokia S40, Symbian S60, Windows 7.1, Android 2.1 and Android 2.2. It’s quite disappointing that Whatsapp will be dropping support for Blackberry device and some other smartphone by the end of the year 2016.
According to a post from Whatsapp blog,they will be dropping support for the Canadian company including BlackBerry 10.

The 2009 company is stepping up to give their users the best expereice ever and to keep their customers conversation in the best state they could ever be.

However, Whatsapp revealed that if you want to continue using Whatsapp, you needs to upgraded to the latest Android device. Also, for the latest BlackBerry Priv that runs on Google OS, you will be able to use Whatsapp on your device.
http://www.thegeekiepedia.com/whatsapp-stop-working-blackberry-nokia-s40-symbian-s60-others/