Tell a friend - Sign up form

Tell a friend - Sign up form

Hi there,

I've realized that the sign-up link in the email that people receive from the "Tell a friend" feature is not working.

It links to this error message:

Problem in optin!

The list to which this sign up form is integrated has been made inaccessible. Please contact the website administrator.

But my list are open to opt-in (see attachments). Can you help please?

Thanks,

Lucie