=================ПРОДОЛЖЕНИЕ======================
Вот что мне пишит Дрюпель, когда я пытаюсь создать новое поле field_image_cache:
This content type has inactive fields. Inactive fields are not included in lists of available fields until their modules are enabled.
Add new field: the field name field_image_cache already exists.
Image (field_image_cache) is an inactive image field that uses a Image widget.