Doesn't work on 1.15.2

[Ittiz]

This doesn't install with the latest version not quite sure what's up. Although it's worth pointing out some new blocks were added in this version. But this is what happens when I run install:

npm install
npm WARN npm npm does not support Node.js v10.15.2
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 4, 6, 7, 8, 9.
npm WARN npm You can find the latest version at https://nodejs.org/

> core-js@2.6.11 postinstall /home/user/minecraft-chunk-viewer/node_modules/core-js
> node -e "try{require('./postinstall')}catch(e){}"

Thank you for using core-js ( https://github.com/zloirock/core-js ) for polyfilling JavaScript standard library!

The project needs your help! Please consider supporting of core-js on Open Collective or Patreon: 
> https://opencollective.com/core-js 
> https://www.patreon.com/zloirock 

Also, the author of core-js ( https://github.com/zloirock ) is looking for a good job -)

npm WARN minecraft-chunk-viewer@0.0.0 No repository field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.12 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.12: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

added 895 packages from 457 contributors in 13.495s

Then run build-assets:

npm run build-assets
npm WARN npm npm does not support Node.js v10.15.2
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 4, 6, 7, 8, 9.
npm WARN npm You can find the latest version at https://nodejs.org/

> minecraft-chunk-viewer@0.0.0 build-assets /home/user/minecraft-chunk-viewer
> node scripts

blocks/stone.png could not be loaded
blocks/stone_granite.png could not be loaded
blocks/stone_granite_smooth.png could not be loaded
blocks/stone_diorite.png could not be loaded
blocks/stone_diorite_smooth.png could not be loaded
blocks/stone_andesite.png could not be loaded
blocks/stone_andesite_smooth.png could not be loaded
blocks/dirt.png could not be loaded
blocks/grass_top.png could not be loaded
blocks/grass_side.png could not be loaded
blocks/snow.png could not be loaded
blocks/grass_side_snowed.png could not be loaded
blocks/coarse_dirt.png could not be loaded
blocks/dirt_podzol_side.png could not be loaded
blocks/dirt_podzol_top.png could not be loaded
blocks/cobblestone.png could not be loaded
blocks/planks_oak.png could not be loaded
blocks/planks_spruce.png could not be loaded
blocks/planks_jungle.png could not be loaded
blocks/planks_acacia.png could not be loaded
blocks/planks_big_oak.png could not be loaded
blocks/sapling_oak.png could not be loaded
blocks/sapling_spruce.png could not be loaded
blocks/sapling_birch.png could not be loaded
blocks/sapling_jungle.png could not be loaded
blocks/sapling_acacia.png could not be loaded
blocks/sapling_roofed_oak.png could not be loaded
blocks/bedrock.png could not be loaded
blocks/water_flow.png could not be loaded
blocks/water_still.png could not be loaded
blocks/lava_flow.png could not be loaded
blocks/lava_still.png could not be loaded
blocks/sand.png could not be loaded
blocks/red_sand.png could not be loaded
blocks/gravel.png could not be loaded
blocks/gold_ore.png could not be loaded
blocks/iron_ore.png could not be loaded
blocks/coal_ore.png could not be loaded
blocks/log_oak_top.png could not be loaded
blocks/log_oak.png could not be loaded
blocks/log_spruce_top.png could not be loaded
blocks/log_spruce.png could not be loaded
blocks/log_birch_top.png could not be loaded
blocks/log_birch.png could not be loaded
blocks/log_jungle_top.png could not be loaded
blocks/log_jungle.png could not be loaded
blocks/leaves_oak.png could not be loaded
blocks/leaves_spruce.png could not be loaded
blocks/leaves_birch.png could not be loaded
blocks/leaves_jungle.png could not be loaded
blocks/sponge.png could not be loaded
blocks/sponge_wet.png could not be loaded
blocks/glass.png could not be loaded
blocks/lapis_ore.png could not be loaded
blocks/lapis_block.png could not be loaded
blocks/dispenser_front_vertical.png could not be loaded
blocks/furnace_top.png could not be loaded
blocks/furnace_side.png could not be loaded
blocks/sandstone_normal.png could not be loaded
blocks/sandstone_top.png could not be loaded
blocks/sandstone_carved.png could not be loaded
blocks/sandstone_smooth.png could not be loaded
blocks/noteblock.png could not be loaded
blocks/bed_feet_top.png could not be loaded
blocks/bed_feet_side.png could not be loaded
blocks/bed_feet_end.png could not be loaded
blocks/bed_head_top.png could not be loaded
blocks/bed_head_end.png could not be loaded
blocks/bed_head_side.png could not be loaded
blocks/rail_golden_powered.png could not be loaded
blocks/rail_detector_powered.png could not be loaded
blocks/piston_bottom.png could not be loaded
blocks/piston_top_sticky.png could not be loaded
blocks/piston_side.png could not be loaded
blocks/web.png could not be loaded
blocks/deadbush.png could not be loaded
blocks/tallgrass.png could not be loaded
blocks/double_plant_fern_top.png could not be loaded
blocks/piston_top_normal.png could not be loaded
blocks/wool_colored_white.png could not be loaded
blocks/wool_colored_orange.png could not be loaded
blocks/wool_colored_magenta.png could not be loaded
blocks/wool_colored_light_blue.png could not be loaded
blocks/wool_colored_yellow.png could not be loaded
blocks/wool_colored_lime.png could not be loaded
blocks/wool_colored_pink.png could not be loaded
blocks/wool_colored_gray.png could not be loaded
blocks/wool_colored_silver.png could not be loaded
blocks/wool_colored_cyan.png could not be loaded
blocks/wool_colored_purple.png could not be loaded
blocks/wool_colored_blue.png could not be loaded
blocks/wool_colored_brown.png could not be loaded
blocks/wool_colored_green.png could not be loaded
blocks/wool_colored_red.png could not be loaded
blocks/wool_colored_black.png could not be loaded
blocks/flower_dandelion.png could not be loaded
blocks/flower_rose.png could not be loaded
blocks/flower_blue_orchid.png could not be loaded
blocks/flower_allium.png could not be loaded
blocks/flower_houstonia.png could not be loaded
blocks/flower_tulip_red.png could not be loaded
blocks/flower_tulip_orange.png could not be loaded
blocks/flower_tulip_white.png could not be loaded
blocks/flower_tulip_pink.png could not be loaded
blocks/flower_oxeye_daisy.png could not be loaded
blocks/mushroom_brown.png could not be loaded
blocks/mushroom_red.png could not be loaded
blocks/gold_block.png could not be loaded
blocks/iron_block.png could not be loaded
blocks/stone_slab_side.png could not be loaded
blocks/stone_slab_top.png could not be loaded
blocks/brick.png could not be loaded
blocks/stonebrick.png could not be loaded
blocks/nether_brick.png could not be loaded
blocks/quartz_block_top.png could not be loaded
blocks/quartz_block_side.png could not be loaded
blocks/tnt_bottom.png could not be loaded
blocks/tnt_top.png could not be loaded
blocks/tnt_side.png could not be loaded
blocks/bookshelf.png could not be loaded
blocks/cobblestone_mossy.png could not be loaded
blocks/obsidian.png could not be loaded
blocks/fire_layer_0.png could not be loaded
blocks/redstone_dust_line.png could not be loaded
blocks/diamond_ore.png could not be loaded
blocks/diamond_block.png could not be loaded
blocks/crafting_table_top.png could not be loaded
blocks/crafting_table_side.png could not be loaded
blocks/crafting_table_front.png could not be loaded
blocks/wheat_stage_0.png could not be loaded
blocks/wheat_stage_1.png could not be loaded
blocks/wheat_stage_2.png could not be loaded
blocks/wheat_stage_3.png could not be loaded
blocks/wheat_stage_4.png could not be loaded
blocks/wheat_stage_5.png could not be loaded
blocks/wheat_stage_6.png could not be loaded
blocks/wheat_stage_7.png could not be loaded
blocks/farmland_dry.png could not be loaded
blocks/furnace_front_off.png could not be loaded
blocks/door_wood_lower.png could not be loaded
blocks/door_wood_upper.png could not be loaded
blocks/ladder.png could not be loaded
blocks/rail_normal.png could not be loaded
blocks/door_iron_lower.png could not be loaded
blocks/door_iron_upper.png could not be loaded
blocks/redstone_ore.png could not be loaded
blocks/ice.png could not be loaded
blocks/cactus_bottom.png could not be loaded
blocks/cactus_top.png could not be loaded
blocks/cactus_side.png could not be loaded
blocks/hardened_clay_stained_white.png could not be loaded
blocks/hardened_clay_stained_orange.png could not be loaded
blocks/hardened_clay_stained_magenta.png could not be loaded
blocks/hardened_clay_stained_light_blue.png could not be loaded
blocks/hardened_clay_stained_yellow.png could not be loaded
blocks/hardened_clay_stained_lime.png could not be loaded
blocks/hardened_clay_stained_pink.png could not be loaded
blocks/hardened_clay_stained_gray.png could not be loaded
blocks/hardened_clay_stained_silver.png could not be loaded
blocks/hardened_clay_stained_cyan.png could not be loaded
blocks/hardened_clay_stained_purple.png could not be loaded
blocks/hardened_clay_stained_blue.png could not be loaded
blocks/hardened_clay_stained_brown.png could not be loaded
blocks/hardened_clay_stained_green.png could not be loaded
blocks/hardened_clay_stained_red.png could not be loaded
blocks/hardened_clay_stained_black.png could not be loaded
blocks/sugar_canes.png could not be loaded
blocks/jukebox_top.png could not be loaded
blocks/jukebox_side.png could not be loaded
blocks/pumpkin_top.png could not be loaded
blocks/pumpkin_side.png could not be loaded
blocks/pumpkin_face_off.png could not be loaded
blocks/netherrack.png could not be loaded
blocks/soul_sand.png could not be loaded
blocks/glowstone.png could not be loaded
blocks/portal.png could not be loaded
blocks/pumpkin_face_on.png could not be loaded
blocks/cake_bottom.png could not be loaded
blocks/cake_top.png could not be loaded
blocks/cake_side.png could not be loaded
blocks/glass_white.png could not be loaded
blocks/glass_orange.png could not be loaded
blocks/glass_magenta.png could not be loaded
blocks/glass_light_blue.png could not be loaded
blocks/glass_yellow.png could not be loaded
blocks/glass_lime.png could not be loaded
blocks/glass_pink.png could not be loaded
blocks/glass_gray.png could not be loaded
blocks/glass_silver.png could not be loaded
blocks/glass_cyan.png could not be loaded
blocks/glass_purple.png could not be loaded
blocks/glass_blue.png could not be loaded
blocks/glass_brown.png could not be loaded
blocks/glass_green.png could not be loaded
blocks/glass_red.png could not be loaded
blocks/glass_black.png could not be loaded
blocks/trapdoor.png could not be loaded
items/spawn_egg.png could not be loaded
blocks/mushroom_block_skin_brown.png could not be loaded
blocks/mushroom_block_skin_red.png could not be loaded
blocks/iron_bars.png could not be loaded
blocks/melon_side.png could not be loaded
blocks/melon_top.png could not be loaded
blocks/pumpkin_stem_disconnected.png could not be loaded
blocks/pumpkin_stem_connected.png could not be loaded
blocks/vine.png could not be loaded
blocks/mycelium_side.png could not be loaded
blocks/mycelium_top.png could not be loaded
blocks/waterlily.png could not be loaded
blocks/nether_wart_stage_2.png could not be loaded
blocks/enchanting_table_bottom.png could not be loaded
blocks/enchanting_table_top.png could not be loaded
blocks/enchanting_table_side.png could not be loaded
blocks/cauldron_bottom.png could not be loaded
blocks/cauldron_top.png could not be loaded
blocks/cauldron_side.png could not be loaded
blocks/endframe_top.png could not be loaded
blocks/endframe_side.png could not be loaded
blocks/end_stone.png could not be loaded
blocks/dragon_egg.png could not be loaded
blocks/redstone_lamp_off.png could not be loaded
blocks/redstone_lamp_on.png could not be loaded
blocks/planks_birch.png could not be loaded
blocks/emerald_ore.png could not be loaded
blocks/emerald_block.png could not be loaded
blocks/command_block.png could not be loaded
blocks/beacon.png could not be loaded
blocks/carrots_stage_0.png could not be loaded
blocks/carrots_stage_1.png could not be loaded
blocks/carrots_stage_2.png could not be loaded
blocks/carrots_stage_3.png could not be loaded
blocks/potatoes_stage_0.png could not be loaded
blocks/potatoes_stage_1.png could not be loaded
blocks/potatoes_stage_2.png could not be loaded
blocks/potatoes_stage_3.png could not be loaded
blocks/daylight_detector_side.png could not be loaded
blocks/redstone_block.png could not be loaded
blocks/quartz_ore.png could not be loaded
blocks/rail_activator.png could not be loaded
blocks/dropper_front_vertical.png could not be loaded
blocks/leaves_acacia.png could not be loaded
blocks/leaves_big_oak.png could not be loaded
blocks/log_acacia_top.png could not be loaded
blocks/log_acacia.png could not be loaded
blocks/log_big_oak_top.png could not be loaded
blocks/log_big_oak.png could not be loaded
blocks/slime.png could not be loaded
blocks/iron_trapdoor.png could not be loaded
blocks/prismarine_rough.png could not be loaded
blocks/sea_lantern.png could not be loaded
blocks/hay_block_side.png could not be loaded
blocks/hay_block_top.png could not be loaded
blocks/coal_block.png could not be loaded
blocks/ice_packed.png could not be loaded
blocks/double_plant_sunflower_bottom.png could not be loaded
blocks/double_plant_syringa_bottom.png could not be loaded
blocks/double_plant_grass_bottom.png could not be loaded
blocks/double_plant_fern_bottom.png could not be loaded
blocks/double_plant_rose_bottom.png could not be loaded
blocks/double_plant_paeonia_bottom.png could not be loaded
blocks/double_plant_sunflower_top.png could not be loaded
blocks/double_plant_syringa_top.png could not be loaded
blocks/double_plant_grass_top.png could not be loaded
blocks/double_plant_rose_top.png could not be loaded
blocks/double_plant_paeonia_top.png could not be loaded
blocks/red_sandstone_normal.png could not be loaded
blocks/red_sandstone_top.png could not be loaded
blocks/red_sandstone_bottom.png could not be loaded
blocks/door_spruce_lower.png could not be loaded
blocks/door_spruce_upper.png could not be loaded
blocks/door_birch_lower.png could not be loaded
blocks/door_birch_upper.png could not be loaded
blocks/door_jungle_lower.png could not be loaded
blocks/door_jungle_upper.png could not be loaded
blocks/door_acacia_lower.png could not be loaded
blocks/door_acacia_upper.png could not be loaded
blocks/door_dark_oak_lower.png could not be loaded
blocks/door_dark_oak_upper.png could not be loaded
blocks/chorus_plant.png could not be loaded
blocks/chorus_flower.png could not be loaded
blocks/purpur_block.png could not be loaded
blocks/purpur_pillar.png could not be loaded
blocks/purpur_pillar_top.png could not be loaded
blocks/end_bricks.png could not be loaded
blocks/beetroots_stage_0.png could not be loaded
blocks/beetroots_stage_1.png could not be loaded
blocks/beetroots_stage_2.png could not be loaded
blocks/beetroots_stage_3.png could not be loaded
blocks/grass_path_side.png could not be loaded
blocks/grass_path_top.png could not be loaded
blocks/repeating_command_block_front.png could not be loaded
blocks/chain_command_block_front.png could not be loaded
blocks/magma.png could not be loaded
blocks/nether_wart_block.png could not be loaded
blocks/red_nether_brick.png could not be loaded
blocks/bone_block_side.png could not be loaded
blocks/bone_block_top.png could not be loaded

and yes I have the textures in the proper assets folder. Also is I try to drag and drop a chunk into your demo it doesn't work either, just never shows up and says nothing. However if I drag and drop your demo chunk from your git repo into your demo it works.