Update

lib/migrate.rb

@@ -138,7 +138,7 @@ module Migrate
     rs.map { |r| r.values.first }
   end
 
-  private_class_method :ensure_migrations_table!, :applied_versions, :da_tables
+  private_class_method :ensure_migrations_table!, :applied_versions
 end
 
 # Allow running as a standalone script: ruby /app/lib/migrate.rb