Google Apps脚本错误：“您无权调用openById”

Question

我正在尝试使用我在GitHub上找到的Google脚本。 （它在下面发布。）它应该将Google表格中的数据合并到Google Doc中。但是，当我尝试运行脚本时，我收到一个错误：“您没有权限调用openById”。我研究了这个问题，而且信息是冲突的。但是，我尝试了以下内容：

1. Manually run the function in script editor before adding the trigger to Google sheet.
2. 授权脚本访问我的Google文档数据。
3. Set the triggers for the function to "On Form Submit"
4. 将脚本添加到我的Google表格并按照说明从菜单中运行：合并 - ＆gt;填写模板

我继续得到错误。我看到还有其他人有同样的问题，但到目前为止提供的答案还没有解决问题。任何帮助将不胜感激。

function doMerge() {
  var selectedTemplateId = "1foobarfoobarfoobarfoobarfoobarfoobar";//Copy and paste the ID of the template document here (you can find this in the document's URL)

  var templateFile = DriveApp.getFileById(selectedTemplateId);
  var mergedFile = templateFile.makeCopy();//make a copy of the template file to use for the merged File.
  mergedFile.setName("filled_"+templateFile.getName());//give a custom name to the new file (otherwise it is called "copy of ...")
  var mergedDoc = DocumentApp.openById(mergedFile.getId());
  var bodyElement = mergedDoc.getBody();//the body of the merged document, which is at this point the same as the template doc.
  var bodyCopy = bodyElement.copy();//make a copy of the body

  bodyElement.clear();//clear the body of the mergedDoc so that we can write the new data in it.