thanks done that but I use fee amount that the wallet picks
Done what? I posted three different things for you to do, and none of them involve sending the transaction with a fee.
it work yesterday but not today will try again
is there any way I can see if there is something wrong with the software
as this will be third time of trying to send payment
Post the debug.log. You can find it in Help > Debug Window and clicking the Open button for debug log file. If the file is too big, post as much as you can from the bottom in
http://pastebin.com/ and share the link to that paste.