J'ai trouvé ça :
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Error Code 5: Incompatible menu file...
There are two potential causes of this error.
Problem A
You didn't uninstall an old version of SkyUI before upgrading to 3.0 or newer.
Solution A
Make sure you really removed all traces of older SkyUI versions, then install the new version again.
Installing SkyUI with the Nexus Mod Manager can help you with that, because it will detect and list conflicting files from SkyUI 2.2 and 3.1-alpha.
Problem B
There's another mod that overrides a particular menu file SkyUI is using as well.
Solution B
You'll have to pick one of the two mods.
If you want another mod to be able to override certain menu files of SkyUI while keeping the rest, you can disable these warning messages individually in the SkyUI configuration menu ( Advanced page).
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Mais je vois pas ou j'ai merdé...