Hi saritha123,
There are many Linux users here, but primarily for the social discussion.
You may get a response on your question, if one of them happens to see your post, and has an answer. But, as you saw with your July post, probably not.
Since this appears to be an urgent issue as you say, you might be better served to post your question on the Ubuntu forums, where everyone is geared towards technical help. Also, be sure to search "gnash", to see if your question is already answered.
Here's a link:
Ubuntu Forums
Welcome back.
PS - I know what Gnash is, but have no experience with it, or I would try to help.