MultiValueDictKeyError at

Hello i have this problem :

MultiValueDictKeyError at 

The view is:

matricola = request.POST['matricola']

The form is:

matricola = forms.CharField(label='Matricola',  required = False, max_length=100, widget = forms.TextInput(attrs={'readonly':'readonly'}))

the template is 

{{ form }}

Why i get this error? 

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