[Johneltin]

My file is fine uploaded to Amazon and looks perfect on my Kindle, thanks to a little help I received here, BUT... I upload the same file to Smashwords and it will not pass validation.
Are these errors (below) to do with the chapters and headers? I've re-written and uploaded what I thought were the offending parts but still receive this:

"We have run EPUBcheck on your file, and unfortunately, it has not passed validation. The errors found were":

'sigil_toc_id_10': fragment identifier is not defined in 'OEBPS/Text/Chapter 7.xhtml'
'sigil_toc_id_26': fragment identifier is not defined in 'OEBPS/Text/Chapter 23.xhtml'
'sigil_toc_id_27': fragment identifier is not defined in 'OEBPS/Text/Chapter 23.xhtml'
'sigil_toc_id_28': fragment identifier is not defined in 'OEBPS/Text/Chapter 24.xhtml'
'sigil_toc_id_29': fragment identifier is not defined in 'OEBPS/Text/Chapter 25.xhtml'
'sigil_toc_id_30': fragment identifier is not defined in 'OEBPS/Text/Chapter 26.xhtml'
'sigil_toc_id_34': fragment identifier is not defined in 'OEBPS/Text/Chapter 29.xhtml'
'sigil_toc_id_5': fragment identifier is not defined in 'OEBPS/Text/Chapter 3.xhtml'

No problems found with Sigil FlightCrew.

Any help appreciated. Thanks, John