There are a few things to consider here:
- Gather text only works for Text types (in blueprint), so anything else – Strings or Names will not be gathered. It should look like this
. I think it is worth checking in case you don’t have any and that was the cause of the error.
- Although it looks like the gather text window does not show any output, you can actually see the log if you click in Gather text (the one with the red cross next to it). Try uploading this so we can see where the error is coming from.