Multi error on download or launch


#1

When I start the mod pack :
http://pastebin.com/eC0GnuP6

When I try to launch or download something :

Logging in...
Beginning authlib authentication attempt
successfully created YggdrasilAuthenticationService
Login complete.
FTBRETROSMP
Error while updating modpack: java.io.IOException: Le chemin d’accès spécifié est introuvable
dirs mk'd
Checking local assets file, for MC version1.2.5 Please wait!
library JSON download failed: java.io.FileNotFoundException: C:\Program Files (x86)\versions\1.2.5\1.2.5.json (Le chemin d’accès
spécifié est introuvable)
library JSON not found


#2

Ok I found a solution... Need to open le launcher as an administrator and everything's working