This is a known issue and has to do with the built-in parser, I'm working on an update for it that should fix it... revert you're open_terrain.ini or wait for the update that adds a custom parser. It would also help to know what version of the engine you're running, I tested against 5.6 and 5.10 and it works, can you post your version number and any modifications you made?
That's weird, it looks like io:7 is a logging function... can I get the debug.txt to see where that error originated from?
This is a known issue and has to do with the built-in parser, I'm working on an update for it that should fix it... revert you're open_terrain.ini or wait for the update that adds a custom parser. It would also help to know what version of the engine you're running, I tested against 5.6 and 5.10 and it works, can you post your version number and any modifications you made?