Unable to send files-call through Gtalk – The Solution

Have you ever  been frustrated at your Gtalk just because it would not send files or would not allow you to call your friend , I have been hit by thing several time until I saw the solution somewhere and I am writing the solution here and now,

Now you might be remembering these error messages in google talk,

You cannot call because "Your Friend" is using chat in Gmail or another chat program other than Google Talk.

You cannot send files because "Your Friend" is using chat in Gmail or is using another chat program.