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String index out of range: 0
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java.lang.StringIndexOutOfBoundsException: String index out of range: 0	at java.lang.StringBuffer.charAt(StringBuffer.java:162)	at gnu.inet.encoding.NFKC.canonicalOrdering(NFKC.java:161)	at gnu.inet.encoding.NFKC.normalizeNFKC(NFKC.java:58)	at gnu.inet.encoding.Stringprep.nameprep(Stringprep.java:42)	at gnu.inet.encoding.IDNA.toASCII(IDNA.java:89)	at gnu.inet.encoding.IDNA.toASCII(IDNA.java:55)	at org.archive.net.UURIFactory.fixupDomainlabel(UURIFactory.java:646)	at org.archive.net.UURIFactory.fixupAuthority(UURIFactory.java:608)	at org.archive.net.UURIFactory.fixup(UURIFactory.java:470)	at org.archive.net.UURIFactory.create(UURIFactory.java:340)	at org.archive.net.UURIFactory.getInstance(UURIFactory.java:289)	at org.archive.crawler.datamodel.CrawlURI.createAndAddLinkRelativeToBase(CrawlURI.java:1314)	at org.archive.crawler.extractor.ExtractorHTML.addLinkFromString(ExtractorHTML.java:477)	at org.archive.crawler.extractor.ExtractorHTML.processLink(ExtractorHTML.java:462)	at org.archive.crawler.extractor.ExtractorHTML.processGeneralTag(ExtractorHTML.java:285)	at org.archive.crawler.extractor.ExtractorHTML.extract(ExtractorHTML.java:611)	at org.archive.crawler.extractor.ExtractorHTML.extract(ExtractorHTML.java:557)	at org.archive.crawler.extractor.Extractor.innerProcess(Extractor.java:67)	at org.archive.crawler.framework.Processor.process(Processor.java:112)	at org.archive.crawler.framework.ToeThread.processCrawlUri(ToeThread.java:302)	at org.archive.crawler.framework.ToeThread.run(ToeThread.java:151)