SQL7 databse merge

How to replicate a database on SQL7. I am using the merge and a pull subscription, because the tables made by the application does not have primary keys. However I get two errors. The snapshot fails and I get a an “index already exits” error. On thesuccessful pulls I get this error ” ‘MSmerge_contents’ database error [UX0051]” when I try to access the database. There are some new merge tables in the database formed by the merge.
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