epub check error ERROR(RSC-001): File 'OEBPS/1/toc.ncx' could not be found.

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Has anyone come across this epubcheck error?

ERROR(RSC-001): File 'OEBPS/1/toc.ncx' could not be found.

I have merged a number of epubs and this error repeats for each book in the set. Any suggestions on how it might be resolved are welcome!

Thank you,
Mark

Look in the mentioned directory, compare the content with content mentioned in the manifest of your OPF document - does it really fit together.

Typically toc.ncx is an EPUB 2 navigation document, added to EPUB 3 to ensure backwards compatibility, but not required for EPUB 3.
If you want backwards compatibility, add it, if it is not already there, if not remove the entry from the manifest.

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