unicode error but weird as there is no data yet

The ordinal error is in GroupRegistration becasue if I rem the group line in Register the admin works BUT there is no data in GroupRegistration so how can I have this error? 

Caught UnicodeEncodeError while rendering: 'ascii' codec can't encode character u'\xf6' in position 26: ordinal not in range(128)

Request Method:	GET
Request URL:	http://v31gpl.xxxxxxx.co.uk/admin/userprofile/groupregistration/add/
Django Version:	1.2.7
Exception Type:	TemplateSyntaxError
Exception Value:	Caught UnicodeEncodeError while rendering: 'ascii' codec can't encode character u'\xf6' in position 26: ordinal not in range(128)
Exception Location:	/home/xxxxxxxx/webapps/v31gpl/lib/python2.7/django/utils/encoding.py in force_unicode, line 69
Python Executable:	/usr/local/bin/python

model.py:

class GroupRegistration(models.Model):
    practice_id = models.CharField(max_length=30)
    practice_name = models.CharField(max_length=255, null=True, blank=True)
    principal_contact = models.CharField(max_length=150)
    email = models.EmailField("Email ")
    password = models.CharField("Password  ",max_length=15)
    invoice_address = models.CharField("Address  ", max_length=100, null=True, blank=True)
    inv_address_2 = models.CharField("Address ", max_length=100, null=True, blank=True)
    town_city = models.CharField("Town/City  ", max_length=50, null=True, blank=True)
    postcode = models.CharField("Postcode  ", max_length=50, null=True, blank=True)
    county = models.CharField("County  ", max_length=75, null=True, blank=True)
    number_to_register = models.IntegerField()

    def __unicode__(self):
        return self.practice_name

class Register(models.Model):
    userprofile = models.ForeignKey(UserProfile)
    group = models.ForeignKey(GroupRegistration, null=True, blank=True)

admin.py:

class RegisterInline( admin.TabularInline ):
    model = Register
    extra = 5

class GroupRegistrationAdmin( admin.ModelAdmin ):
    inlines = [RegisterInline]
    list_display = ('practice_id', 'principal_contact',)
    class Media:
        js = (
            '/media-tiny_mce/tiny_mce.js',
            #'/media-tiny_mce/tiny_mce_gzip.php',
            '/media/js/editor.js',
        )

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