Please solve the following
NOTICE HTFS:No space on dev hd(1/42)
df
Look for a disk that has no free space. Delete files to free up space. Ask users before you delete.
HTFS sounds like SCO... if this is SCO UNIX the command is actually dfspace to find out how much space is left.
If you are unable to boot because of the error, you may need to try to boot into single user mode and delete the contents of /tmp.