``
Tweaker.setScriptStage("BIOME_REGISTRY")
Tweaker.createBiome("Mercury","minecraft:plains")
merc = forBiomes("biometweaker:Mercury")

merc.set("temperature",10.0)
merc.set("enableRain", false)
merc.set("name","Mercury")
merc.set("genWeight",0)
merc.set("genVillages",false)
merc.set("genStrongholds",false)
merc.set("genScatteredFeatures",false)
merc.set("topBlock","GalaxySpace:mercuryblocks")
merc.set("fillerBlock","GalaxySpace:mercuryblocks:1")

merc.removeOre("DIAMOND")
merc.removeOre("EMERALD")
merc.removeOre("ANDESITE")
merc.removeOre("CUSTOM")
merc.removeOre("SILVERFISH")
merc.removeOre("GRANITE")
merc.removeOre("DIORITE")
merc.removeOre("QUARTZ")
merc.removeOre("COAL")
merc.removeOre("REDSTONE")
merc.removeOre("DIRT")
merc.removeAllSpawns("CREATURE")
merc.removeAllSpawns("MONSTER")
merc.removeAllSpawns("AMBIENT")
merc.removeAllSpawns("WATER_CREATURE")
merc.removeDecoration("BIG_SHROOM")
merc.removeDecoration("CACTUS")
merc.removeDecoration("CLAY")
merc.removeDecoration("DEAD_BUSH")
merc.removeDecoration("DESERT_WELL")
merc.removeDecoration("LILYPAD")
merc.removeDecoration("FLOWERS")
merc.removeDecoration("FOSSIL")
merc.removeDecoration("GRASS")
merc.removeDecoration("ICE")
merc.removeDecoration("LAKE_WATER")
merc.removeDecoration("LAKE_LAVA")
merc.removeDecoration("PUMPKIN")
merc.removeDecoration("REED")
merc.removeDecoration("ROCK")
merc.removeDecoration("SAND")
merc.removeDecoration("SAND_PASS2")
merc.removeDecoration("SHROOM")
merc.removeDecoration("TREE")
merc.removeDecoration("CUSTOM")
merc.removeFeature("DUNGEON")
merc.removeFeature("FIRE")
merc.removeFeature("GLOWSTONE")
merc.removeFeature("ICE")
merc.removeFeature("LAKE")
merc.removeFeature("LAVA")
merc.removeFeature("NETHER_LAVA")
merc.removeFeature("NETHER_LAVA2")
merc.removeFeature("NETHER_MAGMA")
merc.removeFeature("ANIMALS")
merc.removeFeature("CUSTOM")
merc.removeGeneratorBOP("roots")
merc.removeGeneratorBOP("miners_delight")
merc.removeGeneratorBOP("glowshrooms")

merc.registerGenBlockRep("minecraft:gold_ore","GalaxySpace:mercuryblocks:9")
merc.registerGenBlockRep("minecraft:iron_ore","GalaxySpace:mercuryblocks:4")
merc.registerGenBlockRep("minecraft:lapis_ore","GalaxySpace:mercuryblocks:5")
merc.registerGenBlockRep("minecraft:stone","GalaxySpace:mercuryblocks:2")
``
[19:27:10] [Server thread/ERROR] [SuperScript]: Failed to execute script command: set @ ScriptContext(scriptName=Mercury.cfg, lineNumber=12). Reason: No block found for resource location galaxyspace:mercuryblocks:1

I can't set block metadata when I am setting fillerblock. Also, when I setted fillerblock as dirt not to make error, It isn't works to change stone and ores to another blocks.(registerGenBlockRep)