Try invoking svrmgrl first at server site.
If it doesn't work, you need to create password authentication file by using orapwd(orapwd80/orapwd81 if nt)
do this when db is down.
orapwd file=/u01/app/oracle/product/805/dbs/pwdSID.ora \
if you need to login from remote, edit REMOTE_LOGIN_PASSWORDFILE=shared /* exclusive */
in your initSID.ora file.
and restart your db.
I don't know wether this actually relates to your problem. But I got the same kind of errors once and the problem was due to a bad patch installation. It messed up the make file and I had to send the make.log to oracle support for them to figure this out. I had to reinstall everything. Just an idea, may or may not be your case here.