Data pack validation failed (very fun)

Im attempting to make a custom structure using jigsaw blocks, however the data pack I made isn't verifying. Console Log Errors: https://pastebin.com/T1vuaJGR playplace_world> data> bs> structures> dun_rooms> nbt files worldgen> structure> dun_structures.json> structure_set> playplace.json> template_pool> dun.json> fallback.json> start.json>