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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)