Migrate trustees fails on some user objects

Some of my user objects are pulling over just fine and getting placed in their groups and get access to the specified files on the server. However a handful or 1/4 of my users wont pull and I get this error in migration.log.
Any ideas on the problem and or at least where to look?

2011-12-30 16:02:18,967 ERROR - FILESYSTEM:migtrustees:Error: command LC_ALL=en_US;ldapadd -H ldaps://10.194.50.18:636 -W -D "cn=###,o=###" -c -x -f /tmp/migdata.ldif 2>&1 2>/tmp/mig-err.txt failed, ldap_add: Object class violation (65) additional info: NDS error: no such class (-604), contents of input LDIF file: dn: CN=####,OU=###,O=##

Thanks,
John