In the past I have often used tags when letting users create a new page, this makes it possible to control content within a single category as well as control visibility. This is done with the following syntax:
[[module NewPage size="25" category="reviews" tags="preview" button="Post Review"]]
That is supposed to automatically add the tag "preview" to the created page. However, when attempting to save the page, I get the message: "An error occurred while processing the request." If I remove the tags portion from the syntax above, only then will it save the page. But for my project, I need to be able to automatically add tags during page creation, not manually after.
Even when I go to an old site where I used tags like this in the past, it no longer works. How do I fix this?