Undefined {objecttype} {objectid} is referenced in {objecttype} <ObjectID>.

This object references another object that has not been defined.

This error occurs when there is a dangling reference. A dangling reference can result from:

Making errors while creating or editing the Semantic Modeling Format (SMF) (for example, typing adress instead of address).
Keeping objects referenced by an object that is being deleted. When deleting an entity, delete the objects that refer to it. This can be done in the Confirm Deletion dialog box.
Importing a model that contains a reference to an object that has been deleted.
Referencing a role in a phrasing that does not exist in the relationship.

To prevent this error:

Delete all objects that refer to the object. By default, English Query deletes the objects which refer to an entity or role that is being deleted. In the Confirm Deletion dialog box, do not clear the In addition, delete the following objects which refer to the entity <entityname> check box.
Check all typing when editing SMF and make sure that the name of the object does not contain typographical errors.

To correct this error: