Invalid pk \"1\" - object does not exist.

getting error

{"manager":["Invalid pk \"1\" - object does not exist."]}

here is my model class

class Employee(models.Model):

    MANAGER = 'MGR'
    STANDARD = 'STD'


    EMPLOYEE_TYPES = (

        (MANAGER, 'manager'),
        (STANDARD, 'employee')

    )


    role = models.CharField(max_length=25, choices=EMPLOYEE_TYPES)
    name = models.CharField(max_length=100, null=True, blank=True)
    employee_id = models.CharField(max_length=100, null=True, blank=True)
    manager = models.ForeignKey('self', null=True, related_name='employee',on_delete=models.CASCADE)


and json data which i am using to save in table

{
  "role":"MGR",
  "name":"John",
  "employee_id" :"IN",
  "manager":1
  
  }

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