Editing Post returns 404 error and unable to edit page/post

I am trying to update which has been already posted but am unable to do it and it gives the following error “Not found Sorry, but you are looking for something that isn’t there”.

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this report extract the posting in CSV format based on the categories selected. Now i want to modify the sequence in which the posting can be extracted, say option 6, 4, 2, 1,5,3. How to do that?

While i was going through the log i found the following errors

Refused to execute a JavaScript script. Source code of script found within request.
post.php:120Uncaught TypeError: Cannot read property ‘style’ of null.

Please help.

Thanks
Dipak