Hi, everyone! Thanks very much to the person who wrote to point this out to me. It seems that when the above-referenced article was posted online, some manual line breaks accidentally made it into the snippets of markup and VBA code that you can copy.
Hopefully, that will be corrected soon - but copying those snippets as is will result in errors that won't let your customUI appear in the document to which you add it. Following is a download and instructions to easily get you the corrections:
(You can also see in the following download that I corrected a typo as well in the initial piece of markup - the paired 'ribbon' tag needs a lowercase R. So, if you copy and edit the markup from the article instead of using the download that follows, do make that change for yourself.)
For later snippets in the article not included in the download, or if you prefer to copy snippets from the article as it currently is, just remove any manual line breaks that fall in the middle of a tag (that is, line breaks that fall between paired angle brackets <>) after you paste the markup into your file. Manual line breaks can't appear in the middle of a tag.
Thanks everybody! ... and Happy Saturday!

