After update an error appears : no more index page! I follow the steps to clear all cache. I try to find the problem myself: Issue #1 : it appears that the tabs created with V5.2.7 do not work properly with V5.2.8, created new tabs with V5.2.8 works. Issue #2 : Module created with V5.2.7 and published on bottom position do not work properly with 5.2.8, delete the row with a button is the solution....but if I cretaed a new button with v5.2.8 it doen't work : error on entire site

I don't know if I will encountered others issues....