My Generator Skript Stopped Working?

[ReaperProgrammer]

I've made this skript work before but when I tested this morning it didn't? Does anyone see anything that could help?

variables:
   {_block1} = black glazed terracotta
   {_block2} = white glazed terracotta
   {_block3} = blue glazed terracotta
   {_range} = 20

#COAL GEN
every 5 seconds:
    loop all players:
        loop all blocks in radius {_range} around loop-player:
            if loop-block is {_block1}:
                drop a coal at loop-block's position

#IRON GEN
every 5 seconds:
    loop all players:
        loop all blocks in radius {_range} around loop-player:
            if loop-block is {_block2}:
                drop a iron ingot at loop-block's position


#DIAMOND GEN
every 5 seconds:
    loop all players:
        loop all blocks in radius {_range} around loop-player:
            if loop-block is {_block3}:
                drop a diamond at loop-block's position


on first join:
    set join message to "Welcome %player% to Darkminey!"
on join:
    player has played before
    set join message to "Welcome back, %player%!"