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Some of the files to process were skipped (not processed) during the operation because of errors.
The SkippingFile event is triggered whenever a file is skipped for any reason during an operation. Sometimes files are skipped because of errors (such as a read or write problem), and other times they are skipped because your application instructed Xceed Zip to skip them (using the bExcluded parameter in the ZipPreprocessingFile or UnzipPreprocessingFile event, for example). You will only get the xerFilesSkipped result code if one of more files were skipped because of errors.
You can write a handler for the SkippingFile event if you want to know what the errors were and which files they were associated with.
This error can only be returned if there are no fatal errors.