Save model int () argument must be string or number, not 'tuple'

I have two forms that I submitted to the template and when I got them all the models were restored and saved, but the last model takes all the other models and saves itself, and also does not save itself. I am getting error like below. Can anyone help me?

Exception Type:  TypeError
Exception Value:  int() argument must be a string or a number, not 'tuple'

      

        
        
        
      

    

I tracked it down and the problem looked like one in the view from the form as it looks like from the form

class AForm(ModelForm):
    mentancy_fee = forms.IntegerField(required=False)

      

        
        
        
      

    

and here is its protection from the model

class AgentLandLordContract(models.Model):
    mentancy_fee = models.IntegerField(default=0,blank=True,null = True)

      

        
        
        
      

    

so why is this form field returning a tuple and not it.I blocked only this submitted from the form and all is well