This error occurs when the internal data format of a .docx file created and saved by software other than Microsoft Word (Libre, OpenOffice, etc.) is changed. When using file translation, make sure that the .docx file was created and saved in Microsoft Word.
If the "translation result file generation error" occurs when translating a PowerPoint file, it could be caused by an issue obtaining decoration locations if there are any objects such as figures or tables. In this case, the problem is caused by an object (such as a figure or table) in the file, so deleting the object in the document that is causing the problem may help.