Hi, thanks for the feedback.
I’ve made a small change to test for the error you encountered, and replaced the txa_ant_2_81_3.zip file with the modified version:
The error was related to an empty material, and I can think of a few reasons why this might have happened. If you wouldn’t mind removing the old version, and installing this replacement, I’d appreciate it.
It may give a different error, or issue. If it seems to work, perhaps try adding a second landscape with a different material and see if that works.