Robotframework 如何在iframe中输入文本？遇到的问题元素必须是用户可编辑的才能清除

这是我的剧本：

Open Admin Dropdown If Closed
Click Element If Visible    ${Liferay_adminDropdownSiteAdministrationLink}
Verify Text Present    Web Content
Click Element If Visible    ${SiteAdministration_addDropdown}
Click Element If Visible    ${SiteAdministration_basicWebContent}
Verify Text Present    New Web Content
Input    ${SiteAdministration_webContentTitleField}    ${newWebContentTitle}
Comment    Select Frame    ${SiteAdministration_webContentContentField}
Comment    Wait Until Element Is Visible    ${SiteAdministration_webContentContentField}
Click Element If Visible    ${SiteAdministration_webContentContentField}
Wait Until Element Is Visible    ${SiteAdministration_webContentContentField}
Input Text    ${SiteAdministration_webContentContentField}    ${newWebContentDescription}

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运行代码时会发生什么情况？@BryanOakley InvalidElementStateException:消息：无效元素状态：元素必须是用户可编辑的才能清除它。因此，问题似乎与框架无关，而是您试图清除不可编辑的元素。您使用的是react或angular之类的框架吗？它是什么意思@BryanOakley？