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An invalid stream modifier was encountered.
 Additional Information
 The modifier is 'X', the stream is 'Y'.
 or
 A buffer cannot appear with the 'REFERENTS-ALLOWED' modifier.
 or
 A referent cannot appear with the 'REFERENTS-ALLOWED' modifier.
Explanation
Certain streams are not allowed to be opened, reopened, or written to with certain modifiers. The only time the REFERENTS-ALLOWED modifier is allowed is when a stream is opened as a file. This is the only time it makes sense, since the referent values are not determined until processing has finished; by this time the buffers and referents can no longer be used, but the files are still around.