【問題描述】

用 UiPath (2019.3.0 Community Edition) 編寫了一個Tool，用 While 循環把整數從 10 ，每次循環+1，一直加到100，並利用 Append Text (UiPath.Word.Activities.DocumentAppendText) 把每次的值存入到Word文件中，但是在保存到 Word 時 Append Text 報錯，下圖是 Designer panel 的 workflow 和 異常截圖

以下是詳細的報錯信息：

An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is:
System.IO.FileFormatException: Archive file cannot be size 0.
   at UiPath.Word.FileDocument..ctor(String documentPath, Boolean createNew)
   at UiPath.Word.Activities.DocumentActivity.BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, Object state)
   at System.Activities.AsyncCodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager)
   at System.Activities.ActivityInstance.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)
   at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)

問題關鍵點：

Append Text: Archive file cannot be size 0.

【解決方法】

原因：

程序中調用的Word文件是新建的，沒有被打開過，也沒有被編輯過

操作：

把調用的 Word 文件打開，隨意寫點字再刪掉，然後保存，再次運行就不報錯了

UiPath - issue - "Append Text: Archive file cannot be size 0." (UiPath.Word.Activities v1.3.0)