I am using CST to simulate reflector antennas. The time domain solver works well. But when I switch to frequency or integral domain, I get the following error. I tried using CST versions 2021, 2022 and 2023 but each time I use frequency or integral solver, I get the following. However, the time domain solver works well for every version. How do I overcome this? What does the following error actually mean? Thanks!
