pdfpages' \includepdf addtotoc 'something wrong with entries' (and log)

addtotoc-mwe

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mwe.tex
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\documentclass{article}
\usepackage{pdfpages}

\begin{document}

\includepdf[addtotoc={2,section,1,Clerk-in 1,clerk1}]{./scans/clerkA1.jpg}

\end{document}

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mwe.log
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This is XeTeX, Version 3.14159265-2.6-0.99998 (TeX Live 2017/Arch Linux) (preloaded format=xelatex 2017.8.5)  31 OCT 2017 17:06
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**mwe
(./mwe.tex
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) (./mwe.aux)
\openout1 = `mwe.aux'.

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)
File: ./scans/clerkA1.jpg Graphic file (type bmp)
<./scans/clerkA1.jpg>
File: ./scans/clerkA1.jpg Graphic file (type bmp)
<./scans/clerkA1.jpg>
File: ./scans/clerkA1.jpg Graphic file (type bmp)
<./scans/clerkA1.jpg>
File: ./scans/clerkA1.jpg Graphic file (type bmp)
<./scans/clerkA1.jpg>
File: ./scans/clerkA1.jpg Graphic file (type bmp)
<./scans/clerkA1.jpg>
 [1

]

Package pdfpages Warning: There's something wrong with the entries
(pdfpages)                of `addtotoc'. Not all entries were
(pdfpages)                processed. Check `addtotoc' on input line 6.

(./mwe.aux) ) 
Here is how much of TeX's memory you used:
 2078 strings out of 492998
 28415 string characters out of 6139962
 96362 words of memory out of 5000000
 6067 multiletter control sequences out of 15000+600000
 3648 words of font info for 15 fonts, out of 8000000 for 9000
 1348 hyphenation exceptions out of 8191
 37i,15n,39p,230b,416s stack positions out of 5000i,500n,10000p,200000b,80000s

Output written on mwe.pdf (1 page).