before i was using permalinks structure by day/name , but one day i change it to only by post,then i feel at Google search when i click at any link it shows error page not find. So i realize the problem and again change permalink form post to day/name. But know i have problem that at webmaster Google account it shows all my post have duplicate title tags issue. for example
I already deactivate SEO plugin but still i am facing this problem . please any one can help me to overcome this issue.