I have seen this issue if i leave tableau desktop open for quite some time and then run an extract.
At what point in time do you see this issue, try running the extract as soon as you open tableau desktop.
Hope this helps.
Whenever I connect to data source and immediately I am trying to extract the data having above issue
Previously I am able to done . but now only I am having issues
What data source are you dealing with?
Can you connect to the data source in a new workbook?