Jenkins CI build failing

[dmitrizagidulin]

https://ci.inria.fr/pharo-contribution/job/DynamicWebDevelopmentWithSeaside/14/console

(Not sure if it's at all related, but I'm also getting this error when trying to build this book).

[dmitrizagidulin]

Fwiw, the new skeleton chapters are building correctly on CI (https://ci.inria.fr/pharo-contribution/job/DynamicWebDevelopmentWithSeaside/15/ ), so, I'll probably close this issue soon, when that's merged into master.