Django FeinCMS:type object'；报告格式'；没有属性'_feincms(内容)类型'；

FeinCms在我的旧django-1.8上运行良好，但当我将它升级到django-2.0时，我遇到了这个错误。我只是被困在这里

型号：

class MyForm(create_base_model()):
    name = models.CharField(max_length=255, default='New Report', unique=True)
    title = models.CharField(max_length=255)

# Attach content types to Report
report = ReportForm()
report.register_regions(
('main', 'Main content'),
)

map(report.create_content_type, CONTENT_TYPES) # CONTENT_TYPES are my custom content types

from feincms.admin.item_editor import ItemEditor
admin.site.register(MyForm, ItemEditor)

管理员：

class MyForm(create_base_model()):
    name = models.CharField(max_length=255, default='New Report', unique=True)
    title = models.CharField(max_length=255)

# Attach content types to Report
report = ReportForm()
report.register_regions(
('main', 'Main content'),
)

map(report.create_content_type, CONTENT_TYPES) # CONTENT_TYPES are my custom content types

from feincms.admin.item_editor import ItemEditor
admin.site.register(MyForm, ItemEditor)