There is a critical bug in SkyVia Replication with respect to adding columns to a replicated Salesforce object.
It seems that replication automatically adds the new column to the list of columns to be replicated. This breaks replication because the column is not present in the target database table.
I strongly suggest that you immediately stop adding a column to the list of replicated columns by default. Exposing the column as not currently being replicated on the UI for the object in question is acceptable.