java.lang.StackOverflowError: Exception in server tick loop

I have just started to use the chunk pregenerator on my RLCraft Modded World, however when i try to preview the map in order to pregenerate the world after a small amount of time i get this game crashed error " java.lang.StackOverflowError: Exception in server tick loop" I would really appreciate some advice of how to fix this as i have a low end computer and cannot play mods without pregen mod. Rlcraft is running on version 1.12.2