you are almost there .(also got your message)
have you still got an empty dbase - good
do everything again - but the PK field - primary key
ok now a couple of ways to do this - either reset -and you have the post on this
or number them your self in xls 1, then 2 etc all the way down - this will work
or leave the auto field blank - it will do the numbers for you - remember its only a number ( although they start bloody high) - i usally start at 10,000- this allows me to put in some extras if need be