Import from external files Fails

Hello,

We are setting up our Market environment, and need to import the unsubscribe contacts from our previous application.
For that, i used the template file provided by Market, but when I try to import it in a preference list, i keep getting the error message : 



The column havn't change from the template, I tried with all possible csv and excel format, i have less than 10k contacts, and no matter what... still getting the same error message.

Have you guys experienced that? How to pass it ?

Thanks

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