/%postname%/ pages aren’t working after upgrade to 2.8.1 in wordpress this is not working.

100% error free solution:

Steps:

1.Close your eye or 5 second then open:
2.Goto admin panel of wordpress and permlinks section using settingd.
3.choose "Custom Structure" /%postname%/
But another work remain there if you are using WAMP SERVER click on wamp icon goto Apache-> Apache Module and check on the rewrite_module
Congrates work is done now your page shows like this:
http://192.168.1.219/blog/hello-world/