To write a definition in a file, it has to write all the information needed to reconstruct each object (and the rest of the information in the document). Chunks are the nestable pieces that make up the writing and reading of files. Each object is responsible for writing and reading its piece when writing or reading a file.
“Output parameter chunk is missing” is telling you that an output has not been written correctly, because when it read the file it expect something that was not there.
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ok, thanks