Thanks for your reply sunny. But it does not work. My permalink setting has been changed somehow it shows (https://mydomain-name/index.php/sample-post/) in post name check box. But when I checked other website permalink it shows (https://mydomain-name/sample-post/) in post name checked box. Actually what happen my hosting provider transferred my websites from one server to another. I have more than hundred websites hosted there. But only two of them showing the problem. Though one think is noticeable that both of those two website is built in wordpress enigma theme. I do not know what is going wrong.
