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 For referent 'X'.
     where X is the name of the referent.
This error occurs when an attempt is made to get the value of a referent using
REFERENTS Key in an action that expects a string value. For example,
the output file in the following code is subject to this error:
     OPEN s WITH REFERENTS-ALLOWED AS REFERENT "A"
     PUT s REFERENT "B"
     CLOSE s
     OUTPUT FILE REFERENTS KEY "A"
     SET REFERENT "B" TO "my.file"
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