Thanks Klas, but :
Before I send my message I first checked all the classic problems:
- Plugin content Seblod to the first position
- Desactivation of some plugin (Widgekit...)
- Test with the template standard protostar.
The problem is still there.
But I finally found the solution after hours of inquiry!
I created a "fulltext" type fields.
Section storage "Select to map an existing column" I selected "fulltext".
That's where the bug happens!
Indeed, when I replace "fulltexte" by "introtext [fulltext]" then there is no problem!
But In the "select list to map an existing column" there's no "introtext [fulltext]" ! (I wrote"introtext [fulltext]" with my keyboard)
BUG :
NOBUG
C'est un bug Seblod?