I'm getting this error displayed in a dialog window after creating a custom visitor group. The custom visitor group's files are entirely identical to an existing custom visitor group that is working as expected. I found this forum post from 2015 with 2 answers that don't really seem to address the issue: https://world.episerver.com/forum/developer-forum/Developer-to-developer/2015/2/personalization/
Anyone able to shed light on this? Seems like a bug in epi.
Thanks in advanced.
Ben