problem after compile

hi dears
i have qt 4.8.0 and vs add in
i wrote my program 2 month ago.and it works fine and it compile & run successfully;
but after 2 month i change my windows and install softwares again.
now when i want to compile it again on my vs2008,after building successfully and compiling when i run this program i get this error:
do you know what is my problem?and what can i do for solving it?