I'm so sorry about this - there's an error in assignment 3 that many of you have undoubtedly found already. The hint for question 1e ("* hint: use the "append" option when saving your document") should NOT be there, please delete or ignore.
That hint was supposed to be only for the following sections, not the first one.
The first time you save a putdocx file, you should not use any options to save it. If you are running through your do-file multiple times and the word document has already been created, you can use the "replace" option for question 1e so that you don't get error messages when you run through your commands the second, third, etc. times.
Again, sincere apologies for the confusion! I have posted a new version without that hint in case anyone has not downloaded yet.