Page 24

Location: Chapter 3, solution to Problem 2

It is (lines 1-3)

    ... It could be that Roberto shaves
    himself, Arturo shaves Roberto, Arturo doesn't shave himself,
    and Roberto doesn't shave Arturo. ...

It should become

    ... It could be that Roberto shaves
    himself, Arturo shaves Roberto, Arturo SHAVES himself,
    and Roberto doesn't shave Arturo. ...

Short explanation

Probably a typesetting issue, since the above correction simply makes the described situation compatible with the requirement of Problem 2. So, no paradox after all.

Credits

Thanks to Rahul's and Henry's comments in this question.