FUNL0046 Unable to open '(ddname)'.

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The sequential output file could not be opened. This could be caused by a missing or invalid DD card (FILEDEF under CMS). Validate and correct the DD card or FILEDEF for the output file. When Fast/Unload is invoked as a standalone load module, a DD is required for each of the sequential data sets declared as an output stream. In versions of Fast/Unload prior to 4.1, the output file is always identified by the FUNOUT DD. If Fast/Unload is invoked via $FUNLOAD, the DDname of the output file is indicated by the fourth argument of the $FUNLOAD function, although this argument need not indicate an existing data set if there are multiple output streams.