Voici mon erreur:
We found a problem with this formula. Try clicking Insert Function on the tab to fix it, or click help for more info on common formula problems.
Not trying to type a formula?
When the first character is an equal (=) or minus (-) sign, Excel thinks it's a formula:
. you type: =1+1, cell shows: 2
To get around this, type an apostrophe (') first:
. you type '=1+1, cell shows =1+1