well you first need to goto cp>Forum permissions.
You don't have any forums setup for the new group (subscription forums)
Either create a new forum or edit a existing one.
You can verify by going to cp>group management
Select the forums link across from the newsletter group.
You will see in each permission that it will show all of the forums and there is nothing in the field no zero or 1 or -1.
That means the group does not have any permissions set for any forum.
If you are editing a existing one then you probably want to delete access from the other groups.
That part is missing now.
