My steps are not showing

from django.db import models


# Create your models here.
class Course(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)
    title = models.CharField(max_length=255)
    description = models.TextField()

    def __str__(self):
        return self.title

class Step(models.Model):
    title = models.CharField(max_length=255)
    description = models.TextField()
    order = models.IntegerField(default=0)
    course = models.ForeignKey(Course)

    def __str__(self):
        return self.title

from django.contrib import admin

from .models import Course, Step


class StepInline(admin.StackedInline):
    model = Step


class CourseAdmin(admin.ModelAdmin):
    inslines = [StepInline,]

# Register your models here.

admin.site.register(Course, CourseAdmin)
admin.site.register(Step)