WebElementFacade未单击网页中的元素

如何解决WebElementFacade未单击网页中的元素

我尝试在Serenity-bdd中编写Click（）函数，作为在框架中使用的通用方法。但是，我将其存储为WebElementFacade的网页元素可以在Click（）函数中调用，如下所示。它没有标识元素并单击。它会以**"NullpointerException"**的形式抛出错误。请帮助我哪里出错了。

注意：如果我将Webelement用作目标类型，则工作正常。但是我需要元素作为WebElementFacade函数来检查更多条件。请帮助解决

WebElementFacade ->存储在如下所示的其他（.java）中，

public class ParabankForm extends PageObject {
    
    
     public WebElementFacade REGISTER_BUTTON = $(By.xpath("//*[text()='Register']"));
}

功能

：

/*
 * Function Name : Click()
 * Author: Koushick Sudharsanam
 * Purpose: The Actor is used to click on the Webelement Target in Webpage
 * 
 */
public void Click(Actor act,WebElementFacade target) {
    
        if(target.isDisplayed()||target.isClickable())
        {
         act.attemptsTo(Click.on(target));
        }
        else
        {
            act.wasAbleTo(target.waitUntilClickable());
            
            if(target.isCurrentlyEnabled() && target.isClickable())
            {
                act.attemptsTo(Click.on(target));
            }
        }
}

所以在分步定义中，我会这样称呼，

@Then("i click on the RegisterButton")
    public void i_click_on_the_register_button() {
        
        Utiltiesfunction.GetInstance().Click(act,obj.REGISTER_BUTTON);
         
    }

错误：

java.lang.NullPointerException
    at net.serenitybdd.core.pages.WebElementResolverByLocator.resolveForDriver(WebElementResolverByLocator.java:25)
    at net.serenitybdd.core.pages.WebElementFacadeImpl.getResolvedELement(WebElementFacadeImpl.java:234)
    at net.serenitybdd.core.pages.WebElementFacadeImpl.getElement(WebElementFacadeImpl.java:229)
    at net.serenitybdd.core.pages.WebElementFacadeImpl.isDisplayed(WebElementFacadeImpl.java:1351)
    at CucumberRunner.my.commonfunction.Utiltiesfunction.Click(Utiltiesfunction.java:37)
    at CucumberRunner.my.stepdefinitions.Parabankdef.i_click_on_the_register_button(Parabankdef.java:84)