Error message after connection

Hello,

After installing httpS on my site and last ES (so not sure who cause what...)
i have error message after every connection (even if i can connect), see :
https://screencast.com/t/gjtIDial2p1


OR
when i came back to a page after minutes whitout use (session expire ?)
i had to reconnect and then go to a white page with error message "...invalide token..."
I had to reload the page
And then i am able to connect but again with the error message


thanks in advance for your help
Loïc