Comment 8 for bug 1926289

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Xavier Guillot (valeryan-24) wrote : Re: pdfarranger TypeError: only pages can be inserted

Or please update pikepdf, bug was corrected in version 2.7.0 (we are at 2.16.1) :

https://github.com/pikepdf/pikepdf/blob/master/docs/release_notes.rst#v270