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I am trying to login to a website using AjaxForm. I managed to retine the forms and reach the xpath of the desired button though when I call #click I get this error:

EcmaError: lineNumber=[193] column=[0] lineSource=[<no source>] name=[ReferenceError] sourceName=[script in https://test.paypo.com/Account/Login?ReturnUrl=%2FHome%2FStart from (177, 32) to (221, 10)]
 message=[ReferenceError: "Paypo" is not defined.
 (script in https://test.paypo.com/Account/Login?ReturnUrl=%2FHome%2FStart from (177, 32) to (221, 10)#193)] 
com.gargoylesoftware.htmlunit.ScriptException: ReferenceError: "Paypo" is not defined. (script in https://test.paypo.com/Account/Login?ReturnUrl=%2FHome%2FStart from (177, 32) to (221, 10)#193)
I am honestly clueless on how to get around this... important note is that I have no access to the source of the website, the actual website logging works perfectly fine.
I've tried using any kind of BrowserVersion and different HtmlUnit versions...
Current code:
                final HtmlPage thePage = ((HtmlPage) page);
                final HtmlButtonInput button = (HtmlButtonInput) thePage.getByXPath("//input[@type='button']").get(0);
                webClient.getOptions().setThrowExceptionOnScriptError(true);
                final HtmlPage newPage = button.click();
Error araises when #click is called!
Any clue? Please!
                Please check first if you get the same error when doing the same action with your browser. And provide a more complete sample code, at least the url you are calling....
– RBRi
                Nov 19, 2018 at 18:24
                I receive no error. @RBRi, though if you'd check you would see that the link is inside the error:  test.paypo.com/Account/Login?ReturnUrl=%2FHome%2FStart thank you for your interest!
– Tyrant Ist
                Nov 20, 2018 at 10:16
Ok have done a short check with this code:
final String url = "https://test.paypo.com/Account/Login?ReturnUrl=%2FHome%2FStart";
try (final WebClient webClient = new WebClient(BrowserVersion.FIREFOX_60)) {
    HtmlPage page = webClient.getPage(url);
Running this produces a bunch of errors; the first one is 
com.gargoylesoftware.htmlunit.ScriptException: identifier is a reserved word: class (https://test.paypo.com/bundles/SharedJS?v=qrYYsvxJCv4nRnx8xzi1sMLBQPQlIPteJjoj8eCO1go1#7)
What does this mean?
The page includes some js code from the url https://test.paypo.com/bundles/SharedJS?v=qrYYsvxJCv4nRnx8xzi1sMLBQPQlIPteJjoj8eCO1go1 and there is a problem with this code. In detail the code uses the javascript 'class' language feature and HtmlUnit (in the end Rhino) does not support this syntax in the current version
Because of this the javascript from this external resource is not 'compilable' and thereof not available for the other javascript on that page
And finally this leads to the error you are facing.
                how'd i go about that? i've got this  import org.openqa.selenium.htmlunit.HtmlUnitDriver;
– Tyrant Ist
                Nov 25, 2018 at 23:59
        
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