When I include 'caption', I get an error saying EntryAdmin.fieldsets[1][1]['fields']' refers to field 'caption' that is missing from the form

In the admin.py; I have imported the classes from joe.models import Entry,Image

Is that because my class from models.py is not getting imported properly ?

Need help in resolving this issue.

Thanks.

models.py

class Image(models.Model):
    image = models.ImageField(upload_to='joe')
    caption = models.CharField(max_length=200)
    imageSrc = models.URLField(max_length=200)
    user = models.CharField(max_length=20)

class Entry(models.Model):
    image = models.ForeignKey(Image)
    mimeType = models.CharField(max_length=20)
    name = models.CharField(max_length=200)
    password = models.URLField(max_length=50)

admin.py

class EntryAdmin(admin.ModelAdmin):
    fieldsets = [
      ('File info', {'fields': ['name','password']}),
      ('Upload image', {'fields': ['image','caption']})]
    list_display = ('name', 'mimeType', 'password') 

admin.site.register(Entry, EntryAdmin)
admin.site.register(Image)