/u00A7. not working. Keeps saying "/u<--[HERE]"

EDIT *

setblock ~ ~1 ~ standing_sign 0 replace {Text1:"{\"text\":\"\",\"clickEvent\":{\"action\":\"run_command\",\"value\":\"setblock ~ ~1 ~ minecraft:command_block 0 replace {Command:/setblock ~0 ~1 ~0 mob_spawner 0 replace {SpawnData:{IsBaby:1,ArmorItems:[{},{},{id:leather_chestplate,Count:1,tag:{display:{color:11615264}}},{id:iron_helmet,Count:1}],HandItems:[{id:stone_pickaxe,Count:1},{}],CustomName:\\u00A78[\\u00A7aLvl. 2\\u00A78] \\u00A77Goblin,CustomNameVisible:1b,id:Zombie},SpawnCount:1,SpawnRange:4,maxNearbyEntities:6,Delay:200,MinSpawnDelay:200,MaxSpawnDelay:220}}\"}}",Text3:"{\"text\":\"[CLICK]\",\"color\":\"dark_purple\",\"bold\":\"true\"}",Text2:"{\"text\":\"FOR CMD\",\"color\":\"dark_red\",\"bold\":\"true\"}"}

OLD *

setblock ~ ~1 ~ standing_sign 0 replace {Text1:"{\"text\":\"\",\"clickEvent\":{\"action\":\"run_command\",\"value\":\"setblock ~ ~1 ~ minecraft:command_block 0 replace {Command:/setblock ~0 ~1 ~0 mob_spawner 0 replace {SpawnData:{IsBaby:1,ArmorItems:[{id:leather_boots,Count:1},{id:leather_leggings,Count:1,tag:{display:{color:11615264}}},{},{}],HandItems:[{id:stone_shovel,Count:1},{}],CustomName:\u00A78[\u00A7aLvl. 1\u00A78] \u00A77Goblin,CustomNameVisible:1b,id:zombie_villager},SpawnCount:1,SpawnRange:4,maxNearbyEntities:2,Delay:200,MinSpawnDelay:200,MaxSpawnDelay:220}}\"}}",Text2:"{\"text\":\"[CLICK]\",\"color\":\"dark_purple\",\"bold\":\"true\"}",Text3:"{\"text\":\"FOR CMD\",\"color\":\"dark_red\",\"bold\":\"true\"}"}