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Please see the screenshot 2 beneath, after my failed attempt to fulfill Step 3:

  1. Search for Convert All Spots to CMYK and run Fix. Now all colors in your document are CMYK.

enter image description here

As advised by the answerer, I had to create this fixup, as my Adobe Acrobat DC Pro lacked it.

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Your PDF doesn't have embedded color space (no ICC profile attached, no OutputIntent defined) so this error will come out for undefined colorspace objects. But for your particular case it doesn't matter, as you want to convert Pantone to default CMYK (probably US SWOP).

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  • Thanks again! After screenshot 2, what do I do? I closed the Preflight window and then continued to Step 4, but I see no CMYK value on p. 22.
    – user121005
    Jan 16 '19 at 6:18
  • Please provide original PDF. I didn't saved it so it's hard to guess what exactly happening on page 22.
    – mrserge
    Jan 16 '19 at 11:31
  • mediafire.com/file/9v8v6em2y2wst3f/…
    – user121005
    Jan 22 '19 at 20:10