command execute / detect failing

Every time I try he detect command it says " can't execute as (my name) old fix that here's the commands I'm trying to use .. : /execute @a ~ ~-2 ~ execute @e[type=armor_stand,name=LIGHT,r=5] ~ ~ ~ setblock ~ ~1 ~ redstone_block /execute @a ~ ~-2 ~ execute @e[type=armor_stand,name=LIGHT,r=6] ~ ~ ~ setblock ~ ~1 ~ air