Make sure you are using the current version, which is posted further down the thread.
direct link
https://ubbdev.com/forums/ubbth...4-rss-topic-creator-v1-1.html#Post323151Prior versions of the script will not work on current UBB.threads. You need to be using the current version of RSS Topic Creator with current versions of UBB.threads.
The current version discussion started in 2019.