FIX: better error message when trying to approve post for closed/deleted topic

app/models/queued_post.rb

@@ -70,7 +70,7 @@ class QueuedPost < ActiveRecord::Base
       created_post = creator.create
 
       unless created_post && creator.errors.blank?
-        raise StandardError, "Failed to create post #{raw[0..100]} #{creator.errors.full_messages.inspect}"
+        raise StandardError.new(creator.errors.full_messages.join(" "))
       end
 
     end