When a user generates a dynamic preview and receives the error “Can’t show a preview because you haven’t set a default creative or your applied filters don’t match any feed rows,” what first step should be taken to troubleshoot the error?

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When a user generates a dynamic preview and receives the error “Can’t show a preview because you haven’t set a …

Read moreWhen a user generates a dynamic preview and receives the error “Can’t show a preview because you haven’t set a default creative or your applied filters don’t match any feed rows,” what first step should be taken to troubleshoot the error?