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java.util.ConcurrentModificationException: 	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:464)	at java.util.AbstractList$Itr.next(AbstractList.java:435)	at com.gargoylesoftware.htmlunit.WebClient.download(WebClient.java:2097)	at com.gargoylesoftware.htmlunit.html.HtmlAnchor.doClickAction(HtmlAnchor.java:109)	at com.gargoylesoftware.htmlunit.html.HtmlAnchor.doClickAction(HtmlAnchor.java:124)	at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1267)	at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1218)	at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1181)