Hello mehrdadfgh . Unfortunately - this bug sometimes appears on upgrading the Cattr client to the 3.x.x version (bug related to rendering library) or installing new its version and we are already working on it. You can try to fix it by shutting down your Cattr client (pay attention, that its icon disappeared from your bottom dock panel), and then removing
%appdata%/cattr/db folder. After it, you can boot again and projects should appear in the list.
But remember, that currently there are displaying only internal projects (that not synced with Redmine or GitLab) in the list.