Your error is actually unrelated to the plugin itself. Did it only start happening after using the plugin? What cheats have you used?
It start when I try to load the both the display.plg and the cheat.plg of mhxx. But when I removed the display.plg of mhxx it runs fine. No errors. But this one, I got errors. The speedfly plugin dont get me some errors though. And suddenly, I have this folder in the root of my sdcard. Named "TIKdevil". Inside of it, there's a file named horns.json. What could be the problem @Slattz ?