Type Error during migrations : "TypeError: fromisoformat: argument must be str"

Using Django Using the ORM
1

Hy…
I have a employeeoriginal model and here in this model i have one date field. Previously i had added another date field but after adding that date field it gives me this error while applying migrations
“TypeError: fromisoformat: argument must be str”, so i remove that field and try to apply migrations again but it stills gives me this error after removing that field what can be the reason for that.

This is my models.py,

class EmployeeOriginal(models.Model):
    employeeObject = models.ForeignKey(
        Employee, on_delete=models.CASCADE, default=False
    )
    SALARY_CHOICES = (
        ('Cash', 'Cash'),
        ('Bank', 'Bank'),
    )

    employeeOriginalID = models.CharField(max_length=15, default=False)
    employeeOriginalName = models.TextField(default=False)
    employeeOriginalFatherName = models.TextField(default=False)
    employeeOriginalCNIC = models.CharField(max_length=15, default=False)
    employeeOriginalContact = models.CharField(max_length=15, default=False)
    employeeOriginalEmail = models.CharField(max_length=15, default=False)
    employeeOriginalSalary = models.CharField(max_length=15, default=False)
    employeeOriginalSalaryMode = models.CharField(max_length=50, default=False, choices=SALARY_CHOICES)
    employeeOriginalBankAccount = models.CharField(max_length=15, default=False, null=True, blank=True)
    employeeOriginalAddress = models.TextField(default=False)
    employeeOriginalDesigination = models.TextField(default=False)
    employeeOriginalDate = models.DateField(null=False)
    employeeImage = models.ImageField(upload_to='images/',default='logo1.png', null=True) 
    is_active = models.BooleanField(default=True)

and this is my traceback error,

File "C:\Users\Noman Ejaz\AppData\Local\Programs\Python\Python310\lib\site-packages\django\utils\dateparse.py", line 74, in parse_date
    return datetime.date.fromisoformat(value)
TypeError: fromisoformat: argument must be str
2

Delete previous migration files that contains the changes and try again.