问让Selenium单击没有ID或名称的单选按钮

EN

<fieldset class="radio-button-list">
                            <label >
                                <span class="className">Text1</span>
                                <input type="radio" value="Button1">
                            </label>
                            <label>
                                <span class="className">Text2</span>
                                <input type="radio" value="Button2">
                            </label>
</fieldset>

driver.FindElement(By.XPath("//button[contains(text(),'Text2')]")).Click();

  OpenQA.Selenium.NoSuchElementException: 'no such element: Unable to locate element: {"method":"xpath","selector":"//button[contains(text(),'Text2')]"}