I trying to locate elemnts in this page and put it in Objects (DomElement) to making some tests of it, the problem is with elemnt reg-error-yid it is a inner-div inside div yid-field-suggestion, I tried to getElementById, byName, byXPath, and getFirstByXPath it's all not working , also I tried to change webClient with WebDriver and use driver.findElement(By.className("oneid-error-message"))
it's also not working
the elemnt of registered message
<div id="reg-error-yid" class="oneid-error-message" data-error="messages.IDENTIFIER_EXISTS" role="alert">A Yahoo account already exists with this email address. <a href="https://login.yahoo.com/?intl=xa&lang=en-JO&src=ym&.intl=xa&specId=yidReg&.done=https%3A%2F%2Fmail.yahoo.com&nr=1&step=2&.crumb=qP.UnkGzfkR&login=abtallaldigital">Sign in</a>.</div>
my code
final HtmlPage page1 = webClient.getPage("https://login.yahoo.com/account/create?specId=yidReg&lang=en-JO&src=ym&done=https%3A%2F%2Fmail.yahoo.com&display=login&intl=xa");
final DomElement firstName = page1.getElementById("usernamereg-firstName");
final DomElement emailAddress = page1.getElementById("usernamereg-yid");
final DomElement takenMsg = page1.getElementById("reg-error-yid");