java.lang.NullPointerException: This exception has no message.

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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 browser.scanners.crawlers.CrawlerBase.clientSignIn(CrawlerBase.java:190)

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