Hi Cyril,
Thanks for raising the issue. It is related to this Error during Environment creation - #4 by lusamino and we are working to fix it ASAP. There are some upgrades happening as we speak to the SV deployment and we expect to have those fixed by the end of the week. In the mean time I believe you should be able to mimic the quick fix in the other discourse post I linked with renku version 0.16.0. Let us know if that works for you.
Sorry about that!