FieldDoesNotExist when adding content_panels fields to Page - wagtail

Question

My head hurts from beating it against this wall ... Why can't the content panels recognize the fields in my DetailPage? Everything works fine until I add the FieldPanels to the content_panels.
Oh, this is using the 2.0 version of wagtail also. This doesn't seem to be related to the field types, event a simple CharBlock triggers this error.
STACK TRACE
Performing system checks...
Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x0000005F7CDB5598>
Traceback (most recent call last):
File "C:\Users\RichardK\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\models\options.py", line 566, in get_field
return self.fields_map[field_name]
KeyError: 'links'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\RichardK\AppData\Local\Programs\Python\Python36\lib\site-packages\django\utils\autoreload.py", line 225, in wrapper
fn(*args, **kwargs)
...
File "C:\Users\RichardK\AppData\Local\Programs\Python\Python36\lib\site-packages\wagtail\admin\edit_handlers.py", line 766, in get_edit_handler
return edit_handler.bind_to_model(cls)
File "C:\Users\RichardK\AppData\Local\Programs\Python\Python36\lib\site-packages\wagtail\admin\edit_handlers.py", line 130, in bind_to_model
new.on_model_bound()
File "C:\Users\RichardK\AppData\Local\Programs\Python\Python36\lib\site-packages\wagtail\admin\edit_handlers.py", line 275, in on_model_bound
for child in self.children]
File "C:\Users\RichardK\AppData\Local\Programs\Python\Python36\lib\site-packages\wagtail\admin\edit_handlers.py", line 275, in <listcomp>
for child in self.children]
File "C:\Users\RichardK\AppData\Local\Programs\Python\Python36\lib\site-packages\wagtail\admin\edit_handlers.py", line 130, in bind_to_model
new.on_model_bound()
File "C:\Users\RichardK\AppData\Local\Programs\Python\Python36\lib\site-packages\wagtail\admin\edit_handlers.py", line 275, in on_model_bound
for child in self.children]
File "C:\Users\RichardK\AppData\Local\Programs\Python\Python36\lib\site-packages\wagtail\admin\edit_handlers.py", line 275, in <listcomp>
for child in self.children]
File "C:\Users\RichardK\AppData\Local\Programs\Python\Python36\lib\site-packages\wagtail\admin\edit_handlers.py", line 130, in bind_to_model
new.on_model_bound()
File "C:\Users\RichardK\AppData\Local\Programs\Python\Python36\lib\site-packages\wagtail\admin\edit_handlers.py", line 479, in on_model_bound
self.db_field = self.model._meta.get_field(self.field_name)
File "C:\Users\RichardK\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\models\options.py", line 568, in get_field
raise FieldDoesNotExist("%s has no field named '%s'" % (self.object_name, field_name))
django.core.exceptions.FieldDoesNotExist: DetailPage has no field named 'links'
models.py
from django.db import models
from wagtail.core.models import Page
from wagtail.core.fields import RichTextField
from wagtail.core import blocks
from wagtail.core.blocks import ListBlock, URLBlock, StructBlock, TextBlock, CharBlock
from wagtail.admin.edit_handlers import FieldPanel
from wagtail.search import index
class DetailPage(Page):
"""
Two column detail page with quick links on the left
"""
links = blocks.ListBlock(blocks.URLBlock(), null=True, blank=True)
body = RichTextField(blank=True)
content_panels = Page.content_panels + [
FieldPanel('links', classname="full"),
FieldPanel('body')
]

Answer 1

ListBlock and other block types such as CharBlock are not interchangeable with Django's model fields - they cannot be used directly within a page model definition, only within a StreamField.