Yep, sure was a syntax error.

src/sql/0-run-first/contributions.sql

@@ -14,7 +14,7 @@ FROM users
          INNER JOIN all_projects ap on project_lifecycle.project_number = ap.refnum
          INNER JOIN contacts on ap.contact_fkey = contacts.pkey
          INNER JOIN clients on contacts.cl_fkey = clients.pkey
-WHERE engineer_contributions.`Project Number` in (SELECT DISTINCT `Project Number` from engineer_contributions)
+WHERE engineer_contributions.`Project Number`
   AND project_lifecycle.new_value IN ('+SEALED')
   AND users.priv & POW(2, 25) > 0;