I also have this issue! I'm pretty new to RPGMaker MZ so if you're willing, I'd appreciate it as dumbed down as possible so I can understand. Thank you for this plugin--super useful and lifesaving!
Below is the error I get. This occurs whenever an encounter tries to start. I also have encounters bound to specific Region IDs if that matters, like the Goblins only have a chance of encounter on Region ID #1
TypeError: this[_0x112404(...)] is not a function
at Game_Enemy.<computed>.<computed> [as setup] (COCOMODE_enemyLevels.js:2287)
at Game_Enemy.initialize (rmmz_objects.js:4948)
at new Game_Enemy (rmmz_objects.js:4940)
at Game_Troop.setup (rmmz_objects.js:5917)
at Game_Troop.<computed>.<computed> [as setup] (COCOMODE_enemyLevels.js:2287)
at Function.BattleManager.setup (rmmz_managers.js:2280)
at Game_Player.executeEncounter (rmmz_objects.js:8302)
at Scene_Map.updateEncounter (rmmz_scenes.js:1052)
at Scene_Map.updateScene (rmmz_scenes.js:989)
at Scene_Map.update (rmmz_scenes.js:826)