LoneDev unable to create native thread: possibly out of memory or process/resource limits reached Your pack is probably very big or has lot of HD textures. Their PC can't keep up. This is not an issue of ItemsAdder but how the game itself works. Minecraft is a resource intensive game.
LoneDev Not really about the pack size itself but the textures height and width. Try to check if you have some big textures, remove them and try to load again. Anyway lowend PCs are not meant to play Minecraft, it's an heavy game.
