Invalid use of #OUTPUT in current stream group encountered.

Additional Information

The #OUTPUT stream may appear at most once in a group of streams, but the current 'X' action contains several.
    where X is output-to or put.

Recovery

Compilation continues but no compiled source code file will be saved.

Explanation

The special stream name #output refers to whatever streams are currently active. The order in which streams are entered in a put or output-to action does not matter, but it is an error to enter a specific stream more than once in a given group.

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