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					Originally Posted by kiwidude  @Eadwulf - this is calling calibre code, so I am willing to bet that doing a Polish or ePub conversion will give you the same error. I think Kovid has actually changed that file with the latest code so looks like it was something he may have fixed for the next release? | 
	
 Thanks for the quick response on this.  I had never used ebook-polish before, so hadn't even thought to check it.  I just got through doing a test and sure enough, it gave the same errors
Using this, I was able to figure out that for some reason it does not like using one of my custom columns in the metadata jacket, specifically a secondary column that provides series like information.  Guess I need to go file a bug report with Kovid on this one.