[support] Validation error, please try again. If this error persists, please contact the site administrator.

[Julien Jabouin]

Hello,

In Admin > Blocks (i using the Amadou theme with Drupal 6) when i save
changes (it's the the same thing if i save without any change), i have
this error : "Validation error, please try again. If this error
persists, please contact the site administrator."

I can't assign blocks to the left sidebar (changes are not saved).

So there is nothing in the report menu, i don't know how to resolve it.

Do you know why ?
Thanks.