Agendav non auth

#1

My YunoHost server

Hardware: laptop asus i7 8Go 2012 64bit
YunoHost version: YunoHost 3.5.2.2 (stable)
I have access to my server : Through SSH
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no / yes
If yes, please explain:

Description of my issue

2019/05/09 18:50:59 [error] 20753#20753: *760 FastCGI sent in stderr: "PHP message: PHP Warning:  Unknown: open(/var/lib/php/sessions/sess_9ii1qlgsvd74nnh8cf62el3bp5, O_RDWR) failed: Permission denied (13) in Unknown on line 0
PHP message: PHP Warning:  Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php/sessions) in Unknown on line 0" while reading upstream, client: 192.168.2.10, server: la-cor.saaslys.com, request: "GET /fichiers/ HTTP/2.0", upstream: "fastcgi://unix:/var/run/php/php7.0-fpm-bozon.sock:", host: "la-cor.saaslys.com", referrer: "https://la-cor.saaslys.com/yunohost/sso/"

https://paste.yunohost.org/buceputibu