what happesn if SUNWcsu package correpted in solaris10 ?

ERROR: Target boot environment not identified as being Solaris 10.
oot@SUN60 # ./installpatchset --s10patchset
ERROR: Target boot environment not identified as being Solaris 10.
solution:
pkg SUNWcsu is correpted
*******so, we again install os & apply patchset********