Hi krileon and thanks for your answer.
In fact, I have 2 problems:
1. the CB1.3 install do not have a French language pluggin. Because of that (i think), i have lost some of my information. Also, CB1.3 have new default fields and without French language pluggin, i do not understand all.
2. when i would like to install CB1.2 on top of CB1.3, i have the error give in my first post.
Because of fields i have created before, i could not uninstall CB then install again CB1.2 without lost all.
Maybe a new French Language pluggin will resolve my issue but i do not know when it will be available.
Any ideas are welcome
Regards
Jérôme