qemu problem

[Mustafa Hussain]

Hi,
i'm trying to run kernel with qemu but i get some errors while running this
command
"
qemu-system-x86_64  --nographic -M pc -no-reboot  -net nic,model=e1000
 -net nic,vlan=0 -net user,hostfwd=tcp:17777:10.0.2.15:22    -hda hd.img
-append "root=/dev/hda1 debug rw console=ttyS0,115200" -s -kernel
"
error says that
qemu-system-x86_64: -net user,hostfwd=tcp:17777:10.0.2.15:22: invalid host
forwarding rule 'tcp:17777:10.0.2.15:22'

qemu-system-x86_64: -net user,hostfwd=tcp:17777:10.0.2.15:22: Device 'user'
could not be initialized

any help ?
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