After reinstalling zen-cart, and when I installed the portuguese pack, i got the same error, and was unable to access the admin area.

This is what i did:
1. Installed zen-cart with fantastico.
2. Uploaded the portuguese pack via ftp and extracted it in admin/includes/languages and includes/languages
3. went to admin panel and added portuguese language
4. the site is ok, i can choose the portuguese language and everything is translated, but afterwards, when i try to enter the admin area, i get this credit card error.

I managed to solve this though, deleting the portuguese pack from admin/includes/languages and duplicating the english language files and renaming the files. Now i have portuguese and english directories, althought they are all english files. It worked, and i don't mind having the admin section in english, but i think it is a serious error that most people can't have.
Can it bebecause the language pack is for version 1.3.7 and i have 1.3.8 installed?