I've got the same issue. It worked for me if I scp to ubuntu 12.04. When I did that to ubuntu 14.04, it failed with same message.
I wrote the scp code based on this example http://www.jcraft.com/jsch/examples/ScpTo.java.html. I guess you too.
If I remove the whitespace after the "T" in the following line, it'll work. Change:
command="T "+(_lfile...
to
command="T"+(_lfile...
Either do that or set ptimestamp = false