Applehead2

I'm trying to import a world from Minecraft into Mine-imator as scenery, which I have done before with no problem, but with some worlds I get an error message whenever I select them. The version I'm using is 1.16.5, with no mods other than Optifine. The error message I'm getting reads as such: "Unhandled exception has occurred in your application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately. Array dimensions exceeded supported range." If I press continue, the error message vanishes but eventually brings up another error, which reads: "Object reference not set to an instance of an object." I'm not sure how to replicate the error, as I don't know what's causing it. I've tried reinstalling Mine-imator, but the issue persists, so I think it has to do with the Minecraft world itself. As I've said before, I can import other worlds as scenery, and they've worked fine in the past (other than being a little laggy, but that's probably just my PC.). The world is singleplayer, if that helps anything. Here's the code that it gives me whenever importing a world fails;