Localhost installation error

when database sectioni am getting
Failed to generate key
Error can some1 help?

Please post the complete error log.

i fix it i install linux server and setup again it fixed but i have new problem
http://sunucu.space/public/
site looking like this now :S

Your domain must point to the public folder, not to the installation folder.

i did, same problem. after installation i cant reach /admin page its give 404
maybe for nginx i am trying apache now