Hi,
As I had informed in my original post, I had already enabled the comments.
Anyway, I found the solution.
It is solved by disabling ” Automatically close comments on articles older than days” option under settings->discussion.
Just an information for other users facing the same issue
Satish
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This reply was modified 7 years, 1 month ago by satish193.
Same problem . suddenly stopped working…
Hope Author will comeup with some fixes