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"Wp-o-matic-Authors" is an add-on to Wp-o-Matic. It automatically creates a new author for each campaign (even if already fetched). Then, each post imported by Wp-o-Matic will have as author the name given by this plugin instead of a name already registered in the core blog. You need to install the Wp-o-Matic version included in this package instead of the official one that does not include some code about authors.