Token security invalide

Archive
1

I have create a web site with grav but when i login in admin she say "Token security invalide"
What is the problem

2

If you’re running the latest stable release of Grav and Admin, there is no known issue apart from this one

3

I have this problem on a fresh installation of the latest Grav Version (1.1.14).
Every time i click on the plugins menu i get the login screen and after login the message “invalid security token”