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java.lang.NullPointerException: 	at com.gargoylesoftware.htmlunit.html.HtmlForm.submit(HtmlForm.java:112)	at com.gargoylesoftware.htmlunit.html.HtmlSubmitInput.doClickAction(HtmlSubmitInput.java:75)	at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1252)	at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1203)	at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1166)	at browser.scanners.crawlers.CrawlerBase.clientSignIn(CrawlerBase.java:190)