Hi there!
It could be a plugin conflict, on a long shot.
But I believe that maybe, is something related to the current map and save file.
Meaning that before, on a previous save file, this map used to have that coordinate, and now it does not have any more. Because the plugin is trying to execute a function to change a tile status(Either trying to cover it or reveal it). And the argument passed to the function(the coordinate) maybe does not exist anymore.
- Did you change your map size?
- Or are you trying to load a previous save file?
- If you try it on a new game, does it still cause the error?
- The error is showing as soon as you enter the map?
- Or when you are calling a plugin command?
- Did you add any new plugins to the project?