Space Pumpkin

I just recently downloaded the Technic Platform and was playing with the mod pack "plus" with a friend of mine and after a while we decided to change our skins. Then next time I try to log in i got the error saying " Error retrieving information for selected pack: Plus" pack". After a bunch of failed attempts to get it working I deleted all of Technic, the launcher, and the mods. Afterwards I reinstall Technic and added the Plus mod pack and I still got the same error message. Can anyone give me good advise? I really want to continue playing this weekend. Thanks