Attempting to use a referent that does not exist.

Additional Information

For referent 'X'.
    where X is the name of the referent.

Explanation

This error occurs when an attempt is made to access a referent using REFERENTS Key or to display a referent (by writing the referent to a stream open with with referents-displayed) that is not defined within the current referents scope (i.e. does not exist on the referents shelf).

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