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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)