Set Wireless Attack

What I did -

1) open set

2) press 1 for se attacks

3) press 7 for wireless attack vectors

4) press 1 for start ap

5) enter wlan0 for interface

6) press enter

7) no changes to rhe conf file... press ctrl+x to exit the file...

8) select 2 for 192.168.1.0-254 range of ips

9) press enter

10) connect to ap from mobile

Problem - when I try to connect to the ap.. it stucks on obtaining ip address. . What do I do??