Now wazapp is working well!!!
How do I manage to register in another time?
Well,as I told before I tried every damn thing: uninstall,re install all wazapp versions,bluestacks....but with the same results: server error/unknown error while registrating.
So I uninstall for the last time (wazapp,folder files,etcetc..) then I tried again with the last version....and nothing: impossible to register my number(with the 3 system,voice,manually,try me).
I let wazapp open in this "position",then via my pc I reinstalled another time bluestacks:i put my number,then it tried to register me.
After few minutes I received on my N9 the 3digit code sms,but,most important, wazapp register itself (without using the code:it did it alone.)
Thanks to all devs for their great work.and specially for the ideas that them share here with us!!!!