需要你的帮助来创建一个量角器打字稿代码,如何点击这个按钮之一？它有_ngcontent类和span类,有没有人知道如何做到这一点？网站上的代码是：

<form _ngcontent-c34 novalidate class="ng-untouched ng-unreal ng-valid">
    <atx-create-license-act-main _ngcontent-c34 _nghost-c36>
       <button _ngcontent-c36 color="accent" mat-raised-button class="mat-raised-button mat-accent">
           <span class="mat-button-wrapper">Add License</span>
           <div class="mat-button-droped mat-droped" matdrop></div>
           <div class="mat-button-focus-overlay"></div>
        </button>
    </atx-create-license-act-main>
</form>
<form _ngcontent-c34 novalidate class="ng-untouched ng-unreal ng-valid">
    <atx-create-license-act-main _ngcontent-c34 _nghost-c36>
       <button _ngcontent-c36 color="accent" mat-raised-button class="mat-raised-button mat-accent">
           <span class="mat-button-wrapper">Add License</span>
           <div class="mat-button-droped mat-droped" matdrop></div>
           <div class="mat-button-focus-overlay"></div>
        </button>
    </atx-create-license-act-main>
</form>

我已经尝试了下面的代码,我似乎无法使它工作……

clickdone = element.all(by.cssContainingText('.mat-button-wrapper','Add License')).get(0);
clickdone = element.all(by.css('button.mat-raised-button.mat-accent')).get(1);
clickdone = element(by.cssContainingText('span.mat-button-wrapper','Add License'));
clickdone = element.all(by.cssContainingText('button.mat-raised-button.mat-accent','Add License')).get(0);

然后表演……

clickdone.click();

他们似乎都没有工作..并且错误说..“失败：元素无法互动”.
这是什么意思？我坚持这一点,任何想法如何做到这一点？