Class Base View Foreign key

Hello,

I have a CBV with Createview. Now i have a Foreign Key from Box to Tabs model. When i submit request then i get error: Cannot assign "1": "Box.tabs_link" must be a "Tabs" instance. This happens on form.is_valid

I understand this error but i don't know how can i fix this. 

Models.py:

class Box(models.Model):

    id = models.AutoField(primary_key=True)

    name = models.CharField(max_length=200, default="", blank=False, null=False) #Überschrift der Box

    tabs_link = models.ForeignKey(Tabs, on_delete=models.CASCADE, null=False,blank=False,choices=[

                                (c.id, c.name) for c in Tabs.objects.all()]

                                   )

    column = models.PositiveIntegerField(choices=column_choices,blank=False, null=False,default=0) #linke oder rechte Seite

    position = models.PositiveIntegerField(default=1,blank=False, null=False) #position auf der linken/rechten Seite

    modul = models.PositiveIntegerField(choices=Modul_Auswahl,

                                        default=0)  

    class Meta:

        ordering = ["position","column"]

    def __str__(self):

        return self.name

Views.py:

class BoxCreateView(CreateView):

    model = Box

    template_name = 'marketing/boxcreate.html'

    form_class = Boxform

    success_url = reverse_lazy('boxlist')

    def post(self, request, *args, **kwargs):

        formbox = Boxform(self.request.POST)

        if (formbox.is_valid()):

           pass

Forms.py

class Boxform(forms.ModelForm):

    class Meta:

        model = Box

        exclude = ('',)

        labels = {

            'tabs_link': 'Tabulator',

            'column': 'Spalte',

        }

        widgets = {

            'name': textinputfeld,

            'position': integerfeld,

            'column': integerfeld,

            'modul': selectfield,

            'tabs_link': selectfield,

        }

Regards

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