When I'm trying to encodemyself backdoor "Server.exe"(Not metasploit's payload),but it hang:

root@bt:/pentest/exploits/framework3# ./msfencode -i /root/Server.exe -c 1 -t exe -e x86/shikata_ga_nai -o sen.exe
[*] exec:./msfencode -i /root/Server.exe -c 1 -t exe -e x86/shikata_ga_nai -o sen.exe

----hang

What will you suggest me to do?? Where is the problem?Thanks a lot



PS
- BT 4 R2 , msf 3.7
- File is generated in windows,normal
- File size is 750 kB