Vincent

@sergey @gosbdc : you are my heroes !!! it works!!!! I knew it was my theme but didn’t know where to fix it.
I just deleted the custom_admin_bar php code from classes.php and it works. I think I could completlty delete this file but it’s called from functions.

So Happy Christmas Guys and a Big Thank You !!

I have the same error message than @dialogcrm and when I switch theme it works perfectly.
None of the solutions above works so I would like to know if someone knows the thing to fix in the theme ?
in functions.php?

thank you.

@theresistance : I have several blogs and your problem (edit mode) appear for me on only one. I suspect this is caused by the wordpress theme.
Besides The top bar doesnot appear for this blog.