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java.lang.StringIndexOutOfBoundsException: String index out of range: 0	at java.lang.StringBuffer.charAt(	at gnu.inet.encoding.NFKC.canonicalOrdering(	at gnu.inet.encoding.NFKC.normalizeNFKC(	at gnu.inet.encoding.Stringprep.nameprep(	at gnu.inet.encoding.IDNA.toASCII(	at gnu.inet.encoding.IDNA.toASCII(	at	at	at	at	at	at org.archive.crawler.datamodel.CrawlURI.createAndAddLinkRelativeToBase(	at org.archive.crawler.extractor.ExtractorHTML.addLinkFromString(	at org.archive.crawler.extractor.ExtractorHTML.processLink(	at org.archive.crawler.extractor.ExtractorHTML.processGeneralTag(	at org.archive.crawler.extractor.ExtractorHTML.extract(	at org.archive.crawler.extractor.ExtractorHTML.extract(	at org.archive.crawler.extractor.Extractor.innerProcess(	at org.archive.crawler.framework.Processor.process(	at org.archive.crawler.framework.ToeThread.processCrawlUri(	at