ex4200 rewrite file system not working

Hello,

i want to rewrite my entire file system but it says cannot load kernel from package (error 2) and this is output of my switch

loader>
loader>
loader> install --format file:///jinstall-12.3R6.6-domestic-signed.gz
cannot load kernel from package (error 2)
loader>

any idea how can i solve it?

thanks,