adding data into database

I was running a populate script to fill data in my database but facing some error

sharing the screenshot

user is a class create in the models.py which contain three fields

class user(models.Model):

firstname=models.CharField(max_length=250,unique=False)

lastname=models.CharField(max_length=250,unique=False)

emailid=models.CharField(max_length=500,unique=True)

def __str__(self):

return self.emailid

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