Recently working on a Drupal site, creating new paragraph types as you do… While creating pages and testing the paragraphs, I got the following error: This entity (paragraph: ID) cannot be referenced. This was the first time I ever saw this error.

What I discovered was I accidentally unselected the paragraph type from the “Reference type” section on the entity reference revision field.

This can happen on any entity reference field not just a paragraph field.

If you create a page and reference an entity or create a paragraph. If the content or paragraph type is unselected from the reference type section. The next time you save the form you’ll get the error.