Question about unicode in django admin

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Python

Django

I've defined a model class in MyApp/models.py:

class Machine_Category(models.Model):
    category = models.CharField(max_length = 100)
    
    def __str__(self):
        return self.category

class Machine(models.Model):
    machine_id = models.CharField(max_length = 100)
    
    category = models.ForeignKey(Machine_Category, on_delete = models.CASCADE)

in http://127.0.0.1:8000/admin/cm/machine_category/ when I want to add a new Machine_Category which category = "线路曝光机", (some Chinese characters). There are some errors occur:
'ascii' codec can't encode characters in position 0-1: ordinal not in range(128)

so when I change category = "exposure" which are not Chinese characters. it can be added successfully.

HOW CAN I ADD CHINESE CHARACTERS?

What I have tried:

when I change category = "exposure" which are not Chinese characters. it can be added successfully.