Django form validation is failing - django

Question

form.is_valid is always set to false in the below code. How do I implement the code to check why its false.
I have given the code to forms.py, model.py and views.py below.
forms defines the form
views processes the form
model defined the model
forms.py
class VolunteerForm(forms.ModelForm):
volposition = forms.CharField(label="VolunteerPosition",widget=forms.Textarea(attrs={'cols':30,'rows':1}))
roledesc = forms.CharField(label="Role Description",widget=forms.Textarea(attrs={'cols':30,'rows':5}))
noofhours = forms.CharField(widget=forms.Select(choices=NO_OF_HRS_MONTH),max_length=2)
Qualreqt = forms.CharField(label="Qualifications and Requirements",widget=forms.Textarea(attrs={'cols':30,'rows':5}))
Duration = forms.CharField(widget=forms.Select(choices=NO_OF_HRS),max_length=2)
Durationyrmon = forms.CharField(widget=forms.Select(choices=YR_MONTH),max_length=10)
posstatus = forms.CharField(widget=forms.Select(choices=POS_STATUS),max_length=1)
teamrelation = forms.CharField(max_length=50)
class Meta:
model = Volunteer
views.py
def volunteersignupform_2_model(form):
if not form.is_valid():
return None
data = form.cleaned_data
signup = Contact(email=data['email'],
phone=data['phone'],
first_name=data['first_name'],
last_name=data['last_name'],
location=data['location'],
other_location=data['other_location'],
new_ac=data['new_ac'],
int_volunteer=data['int_volunteer'],
int_projects=data['int_projects'],
int_fundraise=data['int_fundraise'],
int_it=data['int_it'],
int_programs=data['int_programs'],
int_marketing=data['int_marketing'],
age=data['age'],
occupation=data['occupation'],
intro_source=data['intro_source'],
comments=data['comments'])
signup.save()
# The next line is needed for signup.get_location_display() function to
# work
signup = Contact.objects.get(id=signup.id)
return signup
models.py
NO_OF_HRS = (
('1','1'),
('2','2'),
('3','3'),
('4','4'),
('5','5'),
('6','6'),
('7','7'),
('8','8'),
('9','9'),
('10','10'),
('11','11'),
('12','12'),
)
YR_MONTH = (
("Y", "Year"),
("M", "Month"),
)
POS_STATUS = (
("A", "Active"),
("C", "Closed"),
)
NO_OF_HRS_MONTH = (
("10","10"),
("20","20"),
("30","30"),
("40","40"),
("50","50"),
("60","60"),
("70","70"),
("80","80"),
("90","90"),
)
class Volunteer(models.Model):
datecreated = models.DateTimeField()
volposition = models.CharField(max_length=100)
roledesc = models.CharField(max_length=400)
noofhours = models.CharField(choices=NO_OF_HRS_MONTH,max_length=2)
Qualreqt = models.CharField(max_length=500)
Duration = models.CharField(choices=NO_OF_HRS,max_length=2)
Durationyrmon = models.CharField(choices=YR_MONTH,max_length=10)
posstatus = models.CharField(choices=POS_STATUS,max_length=1)
teamrelation = models.CharField(max_length=50)