I get the same thing on my s4 if I try to complete the action of opening the for sale or trade section using Tapatalk. The only way I have found to view it is to have the link open via chrome or Internet.
Go to settings> more> application manager> Tapatalk> under launch by default click clear defaults. After this it should show that prompt. If you select either the chrome or Internet browser it should open the link.
I had a few issues with tapatalk on my droid. I had to dump it and go with chrome but I don't know about the classifieds. I don't go there on my celly.