syntax check

[Hershel Fisch]

Hi all, what is wrong with this syntax ?
It doesn't save to the destination.

on mouseUp
   create stack "t2"
   answer folder " "
   put it into tP
   save stack "t2" as tp
   set the stackFileType to "myapSTCK"
   set the script of stack "t2" to field "fi"
end mouseUp

Thanks , Hershel