That is the line with the error in the OPF file. This is line 7 in the OPF.
Code:
<dc:title opf:file-as="30-days-to-a-more-organized-life.org">30-days-to-a-more-organized-life.org</dc:title>
Here is the same line fixed.
Code:
<dc:title>30 Days to a More Organized Life</dc:title>
FlightCrew is now happy.