CSRF verification failed. Request aborted.

hello can you hel me to solve the problem:
this is the template:
{% extends "t_base.html" %}
{% block tittle %}{{titolo}}{% endblock %}
{% block main %}
<form action="" method="POST" enctype="multipart/form-data">{%
csrf_token %}
{{form.as_table}}
<p><input type="submit" value="Salva"></input></p>
</form>
{{n_c}}
{% endblock %}

this is the view:

@login_required
def inserisco(request):
import os, time
from django.core.files import File
request.session.set_expiry(0)
titolo = "Inserisci File"
if request.user.is_superuser:
if request.method == 'POST':
form = Form_inserisco(request.POST, request.FILES)
if form.is_valid():
nome_f = form.cleaned_data['nome']
nome = nome_f.name
l = nome_f.size
mio_file = open(nome,'wb')
for chunk in nome_f.chunks():
mf = mio_file.write(chunk)
mio_file.close()
lunghezza = (str(l)+' bytes')
ora_data = time.ctime()
info = form.cleaned_data['info']
descrizione = form.clened_data['descrizione']
salvo_tipi = Finale(nome=nome, dimensione=lunghezza,
data_ora=ora_data, info=info, descrizione=descrizione)
salvo_tipi.save()
salv_corr = """<script type="text/javascript">
{alert('File salvato correttamente')}
</script>"""
n_c = mark_safe(salv_corr)
c = {'form':form, 'titolo':titolo, 'n_c':n_c}
c.update(csrf(request))
return
render_to_response('inserisco.html',c)
else :
form = Form_inserisco()
salv_corr = """<script type="text/javascript">
{alert('Non hai inserito tutti i dati')}
</script>"""
n_c = mark_safe(salv_corr)
return render_to_response('inserisco.html',
{'form':form, 'titolo':titolo, 'n_c':n_c})
else:
form = Form_inserisco()
return render_to_response('inserisco.html', {'form':form,
'titolo':titolo})

I get CSRF verification failed. Request aborted. after the submit

Thanks Luca

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