The "Enabled" property on your Add Link button is false... so, because it's not enabled, you can't click on it... that is, at least, how TestComplete is seeing it. Also, Visible is false... so, something about the object doesn't match what's on screen.
Double check and make sure that you don't have more than one window open... or that there's not another copy of that window open somewhere... or that there isn't some sort of additional "phantom" copy open somewhere... basically, TestComplete is doing what it is designed to do... report that it's attempt to click on the indicated button failed because the properties of the button don't allow for it.